A red ball with a velocity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball after the collision?
A) zero
B) +3.0 m/s
C) -2.0 m/s
D) +2.5 m/s
E) +5.0 m/s

Question

Quizplus · Accepted Answer

In an elastic collision between two objects of equal mass, they exchange velocities. Thus, the yellow ball will have the velocity of the red ball, which is +3.0 m/s.

A Red Ball with a Velocity of +3