Physics (AS & A Level) · May / June 2025 · Paper 11 · Question 11

Two blocks K and L slide towards each other along a horizontal frictionless surface. The diagram shows the momentum of the two blocks just before they collide. [diagram showing block K with 0.72 kg m s^-1 to the right and block L with 0.46 kg m s^-1 to the left] During the collision, the blocks are in contact with each other for a time of 0.084 s. After the collision, the blocks separate and block L moves back along its original path with a momentum of 0.12 kg m s^-1. What is the magnitude of the average force exerted on block L by block K during the collision?

1. A3.1 N
2. B4.0 N
3. C6.9 N
4. D7.1 N

As printed in the paper