(a(i))[1]
State two instants when the ball’s speed is at a maximum.
(a(ii))[2]
Show that the ball’s maximum speed is about $0.08\ \text{m s}^{-1}$.
(b(i))[2]
Fig. 3.3 shows how the potential energy $E_p$ of the ball’s oscillations varies with displacement $x$. On the axes in Fig. 3.3, sketch a graph to show how the kinetic energy of the ball varies with displacement $x$.
(b(ii))[2]
The amplitude of the oscillations decreases over a long time. After many oscillations, the amplitude is $0.60\ \text{cm}$. Use Fig. 3.3 to find the total energy of the ball’s oscillations for an amplitude of $0.60\ \text{cm}$. Explain your working.