Two identical 7-kg bowling balls roll toward each other. The one on the left is moving at +4 m/s while the one on the right is moving at -4 m/s. What is the velocity of each ball after they collide elastically?
A) "Neither is moving."
B) "-14 m/s, 14 m/s"
C) "+4 m/s, -4 m/s"
D) "-4 m/s, +4 m/s"

Question

Quizplus · Accepted Answer

In an elastic collision between two identical masses, they exchange velocities. Hence, the ball initially moving at +4 m/s will move at -4 m/s, and the ball initially moving at -4 m/s will move at +4 m/s after the collision.

Two Identical 7-Kg Bowling Balls Roll Toward Each Other