A rubber ball bounces off of a wall with an initial speed v and reverses its direction so its speed is v right after the bounce. As a result of this bounce, which of the following quantities of the ball are
Conserved? (There could be more than one correct choice.)
A) both the momentum and the kinetic energy of the ball
B) the momentum of the ball
C) the kinetic energy of the ball
D) None of the above quantities are conserved.

Question

Quizplus · Accepted Answer

The kinetic energy of the ball is conserved because its speed remains the same before and after the bounce. However, the momentum is not conserved because the direction of the velocity changes, reversing the momentum.

A Rubber Ball Bounces Off of a Wall with an Initial