Question

Explain what the arrows mean for the motion of Serena's tennis ball.

A. The ball is getting slower as it moves downward.
B. The ball getting faster as it moves upward.
C. The ball is getting faster as it moves downward.
D. The ball is getting slower as it moves upward.

Answer 1

D. The ball is getting slower as it moves upward.

Step-by-step explanation:

The acceleration is negative so velocity is decreasing

Let vt be the velocity at time t and vo the initial velocity

Since a = (vt - v0)/t and a is negative, vt < v0 at any time t. This means velocity at any moment t is decreasing with time