Physics (AS & A Level) · May / June 2020 · Paper 13 · Question 8

A ball of mass m travels vertically downwards and then hits a horizontal floor at speed u. It rebounds vertically upwards with speed v. The collision lasts a time Δt. What is the average resultant force exerted on the ball during the collision?

1. A\frac{mv - mu}{\Delta t} downwards
2. B\frac{mv - mu}{\Delta t} upwards
3. C\frac{mv + mu}{\Delta t} downwards
4. D\frac{mv + mu}{\Delta t} upwards

As printed in the paper