Physics (AS & A Level) · May / June 2016 · Paper 12 · Question 9

A ball falls vertically onto horizontal ground and rebounds, as shown. The ball has momentum p1 downwards just before hitting the ground. After rebounding, the ball leaves the ground with momentum p2 upwards. The ball is in contact with the ground for 0.020 s. During this time interval, an average resultant force of 25 N acts on the ball. What is a possible combination of values for p1 and p2?

1. A$p_1 = 0.15\ \mathrm{kg\,m\,s^{-1}}$, $p_2 = 0.65\ \mathrm{kg\,m\,s^{-1}}$
2. B$p_1 = 0.20\ \mathrm{kg\,m\,s^{-1}}$, $p_2 = 0.30\ \mathrm{kg\,m\,s^{-1}}$
3. C$p_1 = 0.30\ \mathrm{kg\,m\,s^{-1}}$, $p_2 = 0.20\ \mathrm{kg\,m\,s^{-1}}$
4. D$p_1 = 0.65\ \mathrm{kg\,m\,s^{-1}}$, $p_2 = 0.15\ \mathrm{kg\,m\,s^{-1}}$

As printed in the paper