final exam physical science 101

A car accelerates at 2 m/s². Assuming the car starts from rest, how much time does it need to reach a speed of 20 m/s?

10 seconds

An object falls freely from rest on a planet where the acceleration due to gravity is twice as much as it is in earth? In the first 5 seconds it falls a distance of

245 meters

If a total distance ot 750 m is covered in a time interval of 25 seconds, the average speed is?

30 m/s

A car moved 60 km East and 90 km West. What is the displacement?

30 km West

What is the final velocity of a car that accelerated 10 m/s² from rest and traveled 180m?

60 m/s

If a car is going 100 m/s and slows down to 50 m/s in 20 seconds, what is the rate of acceleration?

-2.5 m/s²

A car is moving down a freeway in a straight line at a constant rate of 32.0 m/s for 3.0 s. Its acceleration is

zero

Speed is a vector quantity.

False