(a)[3]
A body falls vertically from rest through air. State and explain the energy changes that occur as it falls.
(b(i))[3]
A ball with mass $150\,\text{g}$ is thrown straight upwards at an initial speed of $25\,\text{m s}^{-1}$. Calculate the initial kinetic energy of the ball.
(b(ii).1)[3]
The ball rises to a height of $21\,\text{m}$ above the release point. For the ball rising to this height, calculate the loss of energy of the ball to air resistance.
(b(ii).2)[2]
The ball rises to a height of $21\,\text{m}$ above the release point. For the ball rising to this height, calculate the average force due to the air resistance.