When you drop a rubber ball on the floor and it bounces, the direction of its velocity reverses because
A) the ball can't stop moving and the floor blocks its path.
B) the ball's momentum is conserved.
C) the ball's energy is conserved.
D) the floor exerts an upward support force on the ball and this force stops the ball's descent and eventually propels it upward.

Question

Quizplus · Accepted Answer

The floor exerts an upward force on the ball when it hits the surface. This force not only stops the ball's downward motion but also propels it upward, reversing the direction of its velocity.

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