A bungee jumper standing on a platform above a river is connected to an elastic rope that is $20\,\text{m}$ long when unstretched. He drops towards the river, and at the lowest point he is $30\,\text{m}$ below the platform. As the jumper falls, his initial gravitational potential energy is converted into other forms of energy. Which other forms of energy are present in the jumper and rope when the jumper has fallen half-way, and when he reaches the lowest point of the jump?
Physics 9702 · AS & A Level · Energy conservation