Physics (AS & A Level) · May / June 2019 · Paper 11 · Question 11

A helium atom of mass m collides normally with a wall. The atom arrives at the wall with speed v and then rebounds along its original path. Assume that the collision is perfectly elastic. What is the change in the momentum of the atom during its collision?

1. Azero
2. B0.5 mv
3. Cmv
4. D2mv

As printed in the paper