(a)[1]
Explain what is meant by the term work done.
(b(i).1)[2]
Calculate the fall in gravitational potential energy of the ball as it drops from the top of the building to the ground.
(b(i).2)[2]
Calculate the rise in kinetic energy of the ball as it falls from the top of the building to the ground.
(b(ii))[2]
Use your answers in (b)(i) to find the average resistive force acting on the ball as it drops from the top of the building to the ground.
(c)[2]
On Fig. 3.1, sketch a line showing how the acceleration $a$ of the ball varies with time $t$ from time $t = 0$ to $t = T$.