(a)[1]
State Hooke’s law for the rope.
(b(i))[1]
Determine the rope’s unstretched length.
(b(ii))[2]
Determine the rope’s spring constant $k$.
(c(i))[2]
For the bungee jumper when they are $120\,\text{m}$ below the bridge: show that the reduction in gravitational potential energy since leaving the bridge is $75\,\text{kJ}$.
(c(ii))[2]
For the bungee jumper when they are $120\,\text{m}$ below the bridge: show that the elastic potential energy in the rope is $75\,\text{kJ}$.
(d)[2]
Explain what can be inferred from the information in (c) about the speed of the bungee jumper at a distance of $120\,\text{m}$ below the bridge.