physics

Vector

Quantity with magnitude (size/amount) and direction

Scalar

Quantity with only size

Velocity

Speed with direction

Weight

Has magnitude and direction (always points downward)

Acceleration

Changing of an object's velocity with time

Deceleration

Reduction in speed

Displacement

shortest straight-line path from a starting point to an ending point

A tennis player on serve tosses a ball straight up. As the tennis ball travels through the air, its speed does which of the following?

remains the same, decreases, increases, decreases and then increases, increases and then decreases

Decreases then increases