Question

A whiffle ball is tossed straight up, reaches a highest point, and falls back down. Ar resistance is negligible; Which of the following statements are true?

I. The ball's speed is zero at the highest point.
II. The bail's acceleration is zero at the highest point.
III. The ball takes the same time to travel up to the highest point than to fall back down.
A. I only
B. II only
C. I & II only
D. I & III only
E. I, II, III

Answer 1

The ball's speed is zero and its acceleration is zero at the highest point. The time taken to reach the highest point is the same as the time taken to fall back down. Therefore, the correct option is E.

Step-by-step explanation:

The correct answer is E. I, II, III.

I. The ball's speed is zero at the highest point because it comes to a momentary stop before falling back down due to the acceleration due to gravity pulling it downward.

II. The ball's acceleration is zero at the highest point because it changes direction from moving upward to moving downward, but its velocity momentarily stops.

III. The ball takes the same time to travel up to the highest point as it does to fall back down because the time taken to reach the highest point is symmetrical to the time taken to fall back to the starting point.