practice questions

1. What is dynamics?

   1. Dynamics is the study of internal forces.

   2. Dynamics is the study of forces and their effect on motion.

   3. Dynamics describes the motion of points, bodies, and systems without consideration of the cause of motion.

   4. Dynamics describes the effect of forces on each other.

2. Two forces acting on an object are perpendicular to one another. How would you draw these in a free-body diagram?

   1. The two force arrows will be drawn at right angles to one another.

   2. The two force arrows will be pointing in opposite directions.

   3. The two force arrows will be at a 45° angle to one another.

   4. The two force arrows will be at a 180° angle to one another.

3. How do you express, mathematically, that no external force is acting on a body?

4. Which forces cause the motion of a system?

   1. Internal forces

   2. External forces

   3. Both internal and external forces

   4. Neither internal nor external forces

5. An object is at rest. Two forces, X and Y, are acting on it. Force X has a magnitude of x and acts in the downward direction.

 What is the magnitude and direction of Y, given that the object remains at rest?

1. The magnitude is x and points in the upward direction.

2. The magnitude is 2x and points in the upward direction.

3. The magnitude is x and points in the downward direction.

4. The magnitude is 2x and points in the downward direction.

6. True or false—A book placed on a balance scale is balanced by a standard 1-kg iron weight placed on the opposite side of the balance. If these objects are taken to the moon and a similar exercise is performed, the balance is still level because gravity is uniform on the moon’s surface as it is on Earth’s surface.

   1. True

   2. False

7. From the equation for Newton’s second law, we see that Fnet is directly proportional to a and that the constant of proportionality is m. What does this mean in a practical sense?

   1. An increase in applied force will cause an increase in acceleration if the mass is constant.

   2. An increase in applied force will cause a decrease in acceleration if the mass is constant.

   3. An increase in applied force will cause an increase in acceleration, even if the mass varies.

   4. An increase in applied force will cause an increase in acceleration and mass.

8. True or false—A person accelerates while walking on the ground by exerting force F1. The ground in turn exerts force F1 on the person. F1 and F2 are equal in magnitude but act in opposite directions. The person is able to accelerate because the two forces act on the different systems and the net force acting on the person is nonzero.

   1. True

   2. False

9.  A person pushes an object of mass 5.0 kg along the floor by applying a force. If the object experiences a friction force of 10 N and accelerates at 18 m/s2, what is the magnitude of the force exerted by the person?

   1. - 90 N

   2.  80 N

   3. 90 N

   4. 100 N

10.  A car weighs 2,000 kg. It moves along a road by applying a force on the road with a parallel component of 560 N. There are two passengers in the car, each weighing 55 kg. If the magnitude of the drag experienced by the car is 45 N, what is the acceleration of the car?

    1. 0.244 m/s2

    2. 0.265 m/s2

    3. 4.00 m/s2

    4. 4.10 m/s2

11.  A 65-kg swimmer pushes on the pool wall and accelerates at 6 m/s2. The friction experienced by the swimmer is 100 N. What is the magnitude of the force that the swimmer applies on the wall?

    1. -490 N

    2. -290 N  

    3. 290 N

    4. 490 N

12.  A person pushes a box from left to right and then lets the box slide freely across the floor. The box slows down as it slides across the floor. When the box is sliding freely, what is the direction of the net external force?

    1. The net external force acts from left to right.

    2. The net external force acts from right to left.

    3. The net external force acts upward.

    4. The net external force acts downward.

13.  True or False—Tension is the result of opposite forces in a connector, such as a string, rope, chain, or cable, that pulls each point of the connector apart in the direction parallel to the length of the connector. At the ends of the connector, the tension pulls toward the center of the connector.

    1. True

    2. False

14.  A large truck with mass 30 m crashes into a small sedan with mass m. If the truck exerts a force F on the sedan, what force will the sedan exert on the truck?

    2. F

    3. 2F

    4. 30F

15.  A body with mass m is pushed along a horizontal surface by a force F and is opposed by a frictional force f. How would you draw a free-body diagram to represent this situation?

    1. A dot with an arrow pointing right, labeled F, and an arrow pointing left, labeled f, that is of equal length or shorter than F

    2. A dot with an arrow pointing right, labeled F, and an arrow pointing right, labeled f, that is of equal length or shorter than F

    3. A dot with an arrow pointing right, labeled F, and a smaller arrow pointing up, labeled f, that is of equal length or longer than F

    4. A dot with an arrow pointing right, labeled F, and a smaller arrow pointing down, labeled f, that is of equal length or longer than F

16.  When you push a door closer to the hinges, why does it open more slowly?

    1. It opens slowly because the lever arm is shorter, so the torque is large.

    2. It opens slowly because the lever arm is longer, so the torque is large.

    3. It opens slowly because the lever arm is shorter, so the torque is less.

    4. It opens slowly because the lever arm is longer, so the torque is less.

17.  Consider two spinning tops with different radii. Both have the same linear instantaneous velocities at their edges. 

Which top has a higher angular velocity?

1. The top with the smaller radius because the radius of curvature is inversely proportional to the angular velocity

2. The top with the smaller radius because the radius of curvature is directly proportional to the angular velocity

3. The top with the larger radius because the radius of curvature is inversely proportional to the angular velocity

4. The top with the larger radius because the radius of curvature is directly proportional to the angular velocity

18.  An object’s angular acceleration is 36 rad/s2. If it were initially spinning with a velocity of 6.0 rad/s, what would its angular velocity be after 5.0 s?

    1. 186 rad/s

    2. 190 rad/s2

    3. -174 rad/s

    4.  -174 rad/s2

19.  When a fan is switched on, it undergoes an angular acceleration of 150 rad/s2. How long will it take to achieve its maximum angular velocity of 50 rad/s?

    1. −0.03 s

    2. −0.3 s

    3. 0.3 s

    4. 3.0 s

20.  What kind of quantity is torque?

    1. Scalar

    2. Vector

    3. Dimensionless

    4. Fundamental quantity

21.  If a linear force is applied to a lever arm farther away from the pivot point, what happens to the resultant torque?

    1. It decreases.

    2. It increases.

    3. It remains the same.

    4. It changes the direction.

22.  How can the same force applied to a lever produce different torques?

    1. By applying the force at different points on the lever arm along the length of the lever or by changing the angle between the lever arm and the applied force

    2. By applying the force at the same point on the lever arm along the length of the lever or by changing the angle between the lever arm and the applied force

    3. By applying the force at different points on the lever arm along the length of the lever or by maintaining the same angle between the lever arm and the applied force

    4. By applying the force at the same point on the lever arm along the length of the lever or by maintaining the same angle between the lever arm and the applied force

23.  What is F in the equation?

    1. Linear force

    2. Centripetal force

    3. Angular force

24.  What happens when two torques act equally in opposite directions?

    1. Angular velocity is zero.

    2. Angular acceleration is zero.

25.  True or false—For vectors, the order of addition is important.

    1. True

    2. False

26.  Two people pull on ropes tied to a trolley, each applying 44 N of force. The angle the ropes form with each other is 39.5°. What is the magnitude of the net force exerted on the trolley?

    1. 0 N

    2. 79.6 N

    3. 82.8 N

    4. 88 N

27.  Find for the following vectors:

28.  Consider six vectors of 2 cm each, joined from head to tail to make a hexagon. What would be the magnitude of the addition of these vectors?

    1. 0

    2. 6

    3. 8

    4. 12

29.  Two hikers take different routes to reach the same spot. The first goes 255 m southeast, then turns and goes 82 m at 14° south of east. The second goes 200 m south.

How far and in which direction must the second hiker travel now to reach his destination and meet up with the first hiker?

1. 200 m east

2. 200 m south

3. 260 m east

4. 260 m south

30.  A plane flies north at 200 m/s with a headwind blowing from the north at 70 m/s. What is the resultant velocity of the plane?

    1. 130 m/s north

    2. 130 m/s south

    3. 270 m/s north

    4. 270 m/s south

31. Using the conventional choice for positive and negative axes described in the text, what is the y-component of the acceleration of an object experiencing projectile motion?

    1. -9.8 m/s 

    2. -9.8 m/s^2

    3. 9.8 m/s

    4. 9.8 m/s^2

32. Two identical items, object 1 and object 2, are dropped from the top of a 50-m building. Object 1 is dropped with an initial velocity of 0 m/s, while object 2 is thrown straight downward with an initial velocity of 13 m/s. What is the difference in time, in seconds rounded to the nearest tenth, between when the two objects hit the ground?

    1. Object 1 will hit the ground 3.2 s after object 2.

    2. Object 1 will hit the ground 2.1 s after object 2.

    3. Object 1 will hit the ground at the same time as object 2.

    4. Object 1 will hit the ground 1.1 s after object 2.

33.  An object is launched into the air. If the y-component of its acceleration is 9.8 m/s2, which direction is defined as positive?

    1. Vertically upward in the coordinate system

    2. Vertically downward in the coordinate system

    3. Horizontally to the right side of the coordinate system

    4. Horizontally to the left side of the coordinate system

34.  A water-balloon cannon is fired at 30 m/s at an angle of 50° above the horizontal. How far away will it fall?

    1. 2.35 m

    2. 3.01 m

    3. 70.35 m

    4. 90.44 m

35.  A person wants to fire a water-balloon cannon such that it hits a target 100 m away. If the cannon can only be launched at 45° above the horizontal, what should its initial speed be when it is launched?

    1. 31.3 m/s

    2. 37.2 m/s

    3. 980 m/s

    4. 1,385.9 m/s

36.  A ball is thrown into the air at an angle of 40°. If the maximum height it reaches is 10 m, what must be its initial speed?

    1. 17.46 m/s

    2. 21.78 m/s

    3. 304.92 m/s

    4. 474.37 m/s

37.  A large rock is ejected from a volcano with a speed of 30 m/s at an angle 60° above the horizontal. The rock strikes the side of the volcano at an altitude 10.0 m lower than its starting point. 

What is the distance traveled by the rock?

1. 84.9 m

2. 96.59 m

3. 169.8 m

4. 193.2 m

38. Consider two pits on a CD, one close to the center and one close to the outer edge. When the CD makes one full rotation, which pit would have gone through a greater angle of rotation? Which one would have covered a greater arc length?

    1. The one close to the center would go through the greater angle of rotation. The one near the outer edge would trace a greater arc length.

    2. The one close to the center would go through the greater angle of rotation. The one near the center would trace a greater arc length.

    3. Both would go through the same angle of rotation. The one near the outer edge would trace a greater arc length.

    4. Both would go through the same angle of rotation. The one near the center would trace a greater arc length.

39.  What happens to tangential velocity as the radius of an object increases, provided the angular velocity remains the same?

    1. It increases because tangential velocity is directly proportional to the radius.

    2. It increases because tangential velocity is inversely proportional to the radius.

    3. It decreases because tangential velocity is directly proportional to the radius.

    4. It decreases because tangential velocity is inversely proportional to the radius.

40.  Yes or no—Is an object in uniform circular motion accelerating? Why or why not?

    1. Yes, because the velocity is not constant

    2. No, because the velocity is constant

    3. Yes, because the velocity is constant

    4. No, because the velocity is not constant

41.  An object is in uniform circular motion. Suppose the centripetal force was removed. In which direction would the object now travel?

    1. In the direction of the centripetal force

    2. In the direction opposite the direction of the centripetal force

    3. In the direction of the tangential velocity

    4. In the direction opposite the direction of the tangential velocity

42.  What is the angle formed between the vectors of tangential velocity and centripetal force?

    1. 0°

    2. 30°

    3. 90°

    4. 180°

43.  What is the frictional force between the tires and the road that allows a 1,000-kg car traveling at 30 m/s to round a 20-m radius curve?

    1. 22 N

    2. 667 N

    3. 1,500 N

    4. 45,000 N

44.  As the mass of an object in uniform circular motion increases, what happens to the centripetal force required to keep it moving at the same speed?

    1. It increases because the centripetal force is directly proportional to the mass of the rotating body.

    2. It increases because the centripetal force is inversely proportional to the mass of the rotating body.

    3. It decreases because the centripetal force is directly proportional to the mass of the rotating body.

    4. It decreases because the centripetal force is inversely proportional to the mass of the rotating body.

45.  What is the frictional force between the tires and the road that allows a 1,000-kg car traveling at 30 m/s to round a 20-m radius curve?

    1. 22 N

    2. 667 N

    3. 1,500 N

    4. 45,000 N

46.  A clock has a radius of 0.5 m. The outermost point on its minute hand travels along the edge. What is its tangential speed?

47.  What is the centripetal force exerted on a 1,600-kg car that rounds a 100-m radius curve at 12 m/s?

    1. 192 N

    2. 1,111 N

    3. 2,300 N

    4. 13,333 N

48.  A boat travels across a river with a velocity of 4 m/s directly north. The river flows east at 3 m/s. What is the resultant velocity of the boat relative to the shore?

    1. 5 m/s northeast

    2. 7 m/s northeast

    3. 1 m/s north

    4. 3.5 m/s northeast

49.  Two forces of 30 N and 40 N act on an object at a 90° angle to each other. What is the magnitude of the resultant force?

    1. 70 N

    2. 50 N

    3. 30 N

    4.  40 N

50.  A person walks 5 m east, then 5 m north. What is the total displacement from the starting point?

    1. 5 m northeast

    2. 10 m northeast

    3. 7.07 m northeast

    4. 15 m northeast

51.  A car travels 12 km north and then 5km west. What is the total displacement of the car?

    1. 12.5km

    2. 13.0km

    3. 10.0km

    4. 17.0km

52.  A force of 50N acts at 45 degrees to the horizontal. What are the horizontal and vertical components of this force?

    1. 35.4N,35.4N

    2. 25.0N,43.3N

    3. 30.0N,40.0N

    4. 50.0N,50.0N

53.  Two forces, 30N and 40N act simultaneously on an object. The 30N and 40N forces are perpendicular. What is the resultant force?

    1. 90N

    2. 70N

    3. 50N

    4. 100N

54.  Two hikers set out from the same campsite. The first hiker travels 150m directly east and then 120m directly north. The second hiker travels 200m directly north. How far and in what direction must the second hiker travel to meet the first hiker?

    1. 200m southeast

    2. 150m east

    3. 170 southeast

    4. 190.0m southeast

55.  A plane flies due north at 50m/s, and a wind blows east at 100m/s. What is the resultant velocity of the plane?

    1. 180m/s northeast

    2. 250m/s northeast

    3. 111.8m/s northeast

    4. 300m/s northeast

56.  Two forces of 60N and 80N act on an object at an angle of 45 degrees to each other. What is the magnitude of the resultant force?

    1. 129.6 N

    2. 100.4 N

    3. 96.5 N

    4. 110.0 N

57. Two vectors have magnitudes of 10N and 15N and are separated by an angle of 60 degrees. What is the magnitude of their resultant vector? 

    1. 18.0N

    2. 20.4N

    3. 25.0N

    4. 30.0N

58.  One revolution is equal to how many radians? Degrees?

    1.  

    2.  

    3.  

    4.  

59.  What is tangential velocity?

    1. Tangential velocity is the average linear velocity of an object in a circular motion.

    2. Tangential velocity is the instantaneous linear velocity of an object undergoing rotational motion.

    3. Tangential velocity is the average angular velocity of an object in a circular motion.

    4. Tangential velocity is the instantaneous angular velocity of an object in a circular motion.

60.  What is the angle of rotation (in degrees) between two hands of a clock if the radius of the clock is 0.70 m and the arc length separating the two hands is 1.0 m?

    1. 40°

    2. 80°

    3. 81°

    4. 163°

61. What is the centripetal force exerted on a 1,600-kg car that rounds a 100-m radius curve at 12 m/s?

    1. 192 N

    2. 1,111 N

    3. 2,300 N

    4. 13,333 N

62.  For a given object, what happens to the arc length as the angle of rotation increases?

    1. The arc length is directly proportional to the angle of rotation, so it increases with the angle of rotation.

    2. The arc length is inversely proportional to the angle of rotation, so it decreases with the angle of rotation.

    3. The arc length is directly proportional to the angle of rotation, so it decreases with the angle of rotation.

    4. The arc length is inversely proportional to the angle of rotation, so it increases with the angle of rotation.

63.  A ball is thrown with an initial speed of 20 m/s at an angle of 30° above the horizontal. What is the maximum height the ball reaches?

    1. 2.0 m

    2. 3.8 m

    3. 5.1 m

    4. 7.2 m

64.  A projectile is launched at a speed of 25 m/s at an angle of 45°. How long does it spend in the air?

    1. 2.4 s

    2. 3.6 s

    3. 4.8 s

    4. 6.2 s

65. A ball is launched at 20 m/s at a 60° angle above the horizontal. How far does it travel horizontally?

    1. 24.8 m

    2. 31.6 m

    3. 35.4 m

    4. 41.2 m

66.  A projectile is launched at 15 m/s at 30°. What is its velocity just before it hits the ground?

    1. 12.0 m/s

    2. 14.2 m/s

    3. 15.0 m/s

    4. 16.5 m/s

67.  A ball is launched horizontally at 10 m/s from a height of 80 m. How long does it take to hit the ground?

    1. 2.8 s

    2. 3.6 s

    3. 4.0 s

    4.  4.5 s

68.  Using the time from Problem 5, find how far the ball travels horizontally.

    1. 36.4 m

    2. 40.4 m

    3. 44.2 m

    4. 48.6 m

69.  A ball is launched horizontally from a cliff at 12 m/s and hits the ground after 5 seconds. What is the height of the cliff?

    1. 98.0 m

    2. 110.5 m

    3. 122.5 m

    4. 135.0 m

70. A projectile is launched at 20 m/s. What angle achieves a range of 40 m?

    1. 25.0°

    2. 32.5°

    3. 39.3°

    4. 45.0°

71. A ball is dropped from a height of 50 m. What is its speed on impact?

    1. 22.1 m/s

    2. 28.5 m/s

    3. 31.3 m/s

    4. 36.2 m/s

72.  A crate with a mass of 25 kg rests on a horizontal floor. If the coefficient of static friction between the crate and the floor is 0.4, what is the minimum force required to start moving the crate?

    1. 90 N

    2. 98 N

    3. 100 N

    4. 120 N

73.  A sled is being pulled across a snowy surface with constant velocity. The sled has a mass of 15 kg, and the coefficient of kinetic friction is 0.1. What is the force exerted to keep it moving?

    1. 12 N

    2. 15 N

    3. 18 N

    4. 25 N

74.  A block slides down a ramp inclined at 20° to the horizontal. The block has a mass of 10 kg, and the coefficient of kinetic friction is 0.15. Calculate the acceleration of the block.

    1. 2.0 m/s²

    2. 2.5 m/s²

    3. 3.0 m/s²

    4.  4.0 m/s²

75.  A 5 kg object is placed on a 30° inclined plane. If the coefficient of static friction is 0.3, determine whether the object will start sliding down the incline.

    1. Yes

    2. No

76.  A 50 kg crate is on an incline of 25°. The coefficient of kinetic friction is 0.2. What force is required to push the crate up the incline at a constant velocity?

    1.  250 N

    2. 320 N

    3. 420 N

    4. 500 N

77.  A skier descends a slope inclined at 15° with the horizontal. The skier's mass is 60 kg, and the coefficient of kinetic friction is 0.05. What is the net force acting on the skier?

    1. 25 N

    2. 35 N

    3. 45 N

    4. 55 N

78.  A box is sliding up a 45° incline with an initial speed of 5 m/s. The box has a mass of 12 kg, and the coefficient of kinetic friction is 0.25. How far does the box slide before coming to rest?

    1. 1.2 m

    2. 1.8 m

    3. 2.0 m

    4. 2.5 m

79.  A block is resting on an incline of 10°. The block has a mass of 8 kg, and the coefficient of static friction is 0.35. Calculate the maximum angle the incline can have before the block starts to slide.

    1. 18°

    2. 20°

    3. 22°

    4. 25°

80.  A ramp has an incline of 40° and a surface with a coefficient of static friction of 0.4. A box with a mass of 20 kg is placed on the ramp. What force is needed to prevent the box from sliding down?

    1. 120 N

    2. 140 N

    3. 160 N

    4. 180 N

81.  A car with a mass of 1500 kg is parked on a hill inclined at 25°. The coefficient of static friction between the tires and the hill is 0.5. Determine whether the car will remain stationary or slide down the hill.

    1. It will remain stationary

    2. It will slide

82.  A position vs. time graph of a frog swimming across a pond has two distinct straight-line sections. The slope of the first section is  1m/s. The slope of the second section is  0m/s. If each section lasts  1 second , then what is the frog’s total average velocity?

    1. 0m/s

    2. 2m/s

    3. 0.5m/s

    4. 1m/s

83.  A graph of velocity vs. time of a ship coming into a harbor is shown.

Describe the acceleration of the ship based on the graph.

1. The ship is moving in the forward direction at a steady rate. Then it accelerates in the forward direction and then decelerates.

2. The ship is moving in the forward direction at a steady rate. Then it turns around and starts decelerating, while traveling in the reverse direction. It then accelerates, but slowly.

3. The ship is moving in the forward direction at a steady rate. Then it decelerates in the forward direction, and then continues to slow down in the forward direction, but with more deceleration.

4. The ship is moving in the forward direction at a steady rate. Then it decelerates in the forward direction, and then continues to slow down in the forward direction, but with less deceleration.

84.  Terri, Aaron, and Jamal all walked along straight paths. Terri walked 3.95 km north in 48 min. Aaron walked 2.65 km west in 31 min. Jamal walked 6.50 km south in 81 min. Which of the following correctly ranks the three boys in order from lowest to highest average speed?

    1. Jamal, Terri, Aaron

    2. Jamal, Aaron, Terri

    3. Terri, Jamal, Aaron

    4. Aaron, Terri, Jamal

85.  In a coordinate system in which the direction to the right is positive, what are the distance and displacement of a person who walks  35 meters to the left,  18 meters to the right, and then  26 meters to the left?

    1. Distance is  79m and displacement is  −43m.

    2. Distance is  −79m and displacement is  43m .

    3. Distance is  43m and displacement is  −79m.

    4. Distance is  −43m and displacement is  79m.

86.  Billy drops a ball from a height of 1 m. The ball bounces back to a height of 0.8 m, then bounces again to a height of 0.5 m, and bounces once more to a height of 0.2 m. Up is the positive direction. What is the total displacement of the ball and the total distance traveled by the ball?

    1. The displacement is equal to –4 m and the distance is equal to 4 m.

    2. The displacement is equal to –1 m and the distance is equal to 1 m

    3. The displacement is equal to 4 m and the distance is equal to 1 m.

    4. The displacement is equal to –1 m and the distance is equal to 4 m.

87.  You sit in a car that is moving at an average speed of 86.4 km/h. During the 3.3 s that you glance out the window, how far has the car traveled?

    1. 7.27 m

    2. 79 m

    3. 285 km

    4. 1026 m

88.  Using the graph, what is the average velocity for the whole 10 seconds?

    1. The total average velocity is 0 m/s.

    2. The total average velocity is 1.2 m/s.

    3. The total average velocity is 1.5 m/s.

    4. The total average velocity is 3.0 m/s.

89.  A train starts from rest and speeds up for 15 minutes until it reaches a constant velocity of 100 miles/hour. It stays at this speed for half an hour. Then it slows down for another 15 minutes until it is still. Which of the following correctly describes the position vs time graph of the train’s journey?

    1. The first 15 minutes is a curve that is concave upward, the middle portion is a straight line with slope 100 miles/hour, and the last portion is a concave downward curve.

    2. The first 15 minutes is a curve that is concave downward, the middle portion is a straight line with slope 100 miles/hour, and the last portion is a concave upward curve.

    3. The first 15 minutes is a curve that is concave upward, the middle portion is a straight line with slope zero, and the last portion is a concave downward curve.

    4. The first 15 minutes is a curve that is concave downward, the middle portion is a straight line with slope zero, and the last portion is a concave upward curve.

90.  Which option best describes the average acceleration from 40 to 70 s?

    1. It is negative and smaller in magnitude than the initial acceleration.

    2. It is negative and larger in magnitude than the initial acceleration.

    3. It is positive and smaller in magnitude than the initial acceleration.

    4. It is positive and larger in magnitude than the initial acceleration.

91.  If a biker rides west for 50 miles from his starting position, then turns and bikes back east 80 miles. What is his net displacement?

    1. 130 miles

    2. 30 miles east

    3. 30 miles west

    4. Cannot be determined from the information given

92.  Using the graph, what is the runner’s velocity from 4 to 10 s?

    1. –3 m/s

    2. 0 m/s

    3. 1.2 m/s

    4. 3 m/s

93.  A car traveling at 10 m/s is traveling at twice the velocity 10 s later. If you made a velocity graph of this motion, what information would be obtained from the area under the graph?

    1. The rate of acceleration of the car.

    2. The area enclosed by the car’s trip.

    3. The car’s displacement during the 10 s.

    4. The velocity of the car at t = 10 s.

94.  An object is moving along a straight path with constant acceleration. A velocity vs. time graph starts at  0 and ends at  10m/s, stretching over a time-span of  15s. What is the object’s net displacement?

    1. 75m

    2. 130m

    3. 150m

    4. cannot be determined from the information given

95.  Calculate that object’s net displacement over the time shown.

    1. 540 m

    2. 2,520 m

    3. 2,790 m

    4. 5,040 m

96.  What would the velocity vs. time graph of the object whose position is shown in the graph look like?

1. It is a straight line with a negative slope.

2. It is a straight line with a positive slope.

3. It is a horizontal line at some negative value.

4. It is a horizontal line at some positive value.