(a)[1]
State an expression for the gravitational potential energy of the coin at height $h$ above the ground and for the kinetic energy of the coin moving at speed $v$.
(b)[3]
A coin is released from the roof of a building that is $380\,\text{m}$ high. Find the coin's speed as it reaches the ground. You may ignore air resistance.
(c(i))[1]
With air resistance negligible, a heavier coin and a lighter coin dropped from the same height strike the ground at the same speed. Explain why.
(c(ii))[2]
When air resistance is present, coins of different masses do not strike the ground at the same speed if they are dropped from the same height. Explain why.