(a)[2]
Distinguish, by comparison, between gravitational potential energy and elastic potential energy.
(b(i)(1))[2]
A ball with mass $65\,\text{g}$ is projected vertically upwards from ground level at a speed of $16\,\text{m s}^{-1}$. Air resistance is negligible. Calculate the initial kinetic energy.
(b(i)(2))[2]
Calculate the ball’s maximum height.
(b(ii))[3]
The ball takes time $t$ to reach maximum height. At time $\frac{t}{2}$ after the ball has been launched, calculate the ratio $$\frac{\text{potential energy of ball}}{\text{kinetic energy of ball}}.$$
(b(iii))[1]
State and explain how air resistance affects the time taken for the ball to reach maximum height.