Physics (AS & A Level) · May / June 2023 · Paper 11 · Question 10

An object of mass m, moving at speed u along a frictionless horizontal surface, collides head-on with a stationary object of mass 4m. After the collision, the object of mass m rebounds along its initial path with 1/4 of its kinetic energy before the collision. What is the speed of the object of mass 4m after the collision?

1. Au/8
2. B3u/16
3. C5u/16
4. D3u/8

As printed in the paper