Physics (AS & A Level) · Feb / March 2021 · Paper 12 · Question 8

A ball strikes a horizontal surface with momentum $p$ at an angle $\theta$ to the surface, as shown. [diagram of ball bouncing off surface with momentum $p$ at angle $\theta$] The ball rebounds with the same magnitude of momentum at an angle $\theta$ to the surface. The ball is in contact with the surface for time $t$. What is the magnitude of the average resultant force acting on the ball during the collision?

1. Azero
2. B$\dfrac{2p}{t}$
3. C$\dfrac{2p\cos\theta}{t}$
4. D$\dfrac{2p\sin\theta}{t}$

As printed in the paper