A rock is thrown straight up and reaches a maximum height. Which of the following describes the motion at the maximum height?
A) The velocity is zero and the acceleration is zero.
B) The velocity is maximum and the acceleration is zero.
C) The acceleration is increasing and the velocity is zero.
D) The acceleration is not changing and the velocity is zero.

Question

Quizplus · Accepted Answer

At the maximum height, the velocity of the rock is zero because it momentarily stops before starting to fall back down. However, the acceleration due to gravity is constant and does not change, meaning it is not zero even at the maximum height.

A Rock Is Thrown Straight Up and Reaches a Maximum