A 120-g rubber ball is thrown with a speed of 10 m/s at an oncoming 900-kg car which is approaching at 30 m/s, and undergoes a one-dimensional elastic collision with the car. What is the speed of the ball after the collision?
A) 10 m/s
B) 30 m/s
C) 40 m/s
D) 50 m/s
E) 70 m/s

Question

Quizplus · Accepted Answer

In an elastic collision, both momentum and kinetic energy are conserved. Using these principles, the final speed of the ball can be calculated to be 70 m/s.

A 120-G Rubber Ball Is Thrown with a Speed of 10