A 300-g billiard ball travelling at 2 m/s collides elastically with an identical stationary billiard ball and bounces off at a 30 degree angle.What is the angle of the other ball's path with respect to the path of the original ball?
A)15 degrees
B)17 degrees
C)22.5 degrees
D)60 degrees
E)More information is needed.

Question

Quizplus · Accepted Answer

In an elastic collision between two identical masses where one is initially at rest, the angles between their directions after the collision will be 90 degrees. Since one ball bounces off at a 30-degree angle, the other ball's path will be at a 60-degree angle with respect to the original ball's path to sum up to 90 degrees.

A 300-G Billiard Ball Travelling at 2 M/s Collides Elastically