Physics (AS & A Level) · May / June 2017 · Paper 12 · Question 16

A stone of mass m falls from rest at the top of a cliff of height h into the sea below. Just before hitting the sea the stone has speed v. What is the average force of air resistance acting on the stone during its fall?

1. Amg
2. B\frac{m(v^2 - 2gh)}{h}
3. Cm\left(g - \frac{v^2}{2h}\right)
4. Dm\left(gh - \frac{v^2}{2}\right)

As printed in the paper