Physics (AS & A Level) · May / June 2020 · Paper 13 · Question 10

A ball of mass m, moving at a velocity v, collides with a stationary ball of mass 2m. The two balls stick together. Which fraction of the initial kinetic energy is lost on impact?

1. A\frac{1}{9}
2. B\frac{1}{3}
3. C\frac{2}{3}
4. D\frac{8}{9}

As printed in the paper