A ball is thrown vertically upward from the surface of the earth. Consider the following quantities: (1) the speed of the ball; (2) the velocity of the ball; (3) the acceleration of the ball.
Which of these is (are) zero when the ball has reached the maximum height?
A)1 and 2 only
B)1 and 3 only
C)1 only
D)2 only
E)1, 2, and 3

Question

Quizplus · Accepted Answer

At the maximum height, the speed and velocity of the ball are zero because it momentarily stops before descending. However, the acceleration due to gravity is not zero; it remains constant at approximately 9.8 m/s² downward.

A Ball Is Thrown Vertically Upward from the Surface of the Earth