The bungee jumper: A jumper jumps off the bridge. She falls freely until she reaches the unstretched length of the rope. Then, the rope begins to stretch and slow her to a stop. It yanks her back up and she oscillates up and down for a while. In order to use common symbols, let’s call the jumper’s mass m, the unstretched length of the rope L0, the height of the bridge above the water H, the spring constant of the rope, k, and the gravitational field strength, g.
a. How fast is she falling when she reaches the length of the unstretched rope?
b. Where is her acceleration maximum?

Question

The bungee jumper: A jumper jumps off the bridge. She falls freely until she reaches the unstretched length of the rope. Then, the rope begins to stretch and slow her to a stop. It yanks her back up and she oscillates up and down for a while. In order to use common symbols, let’s call the jumper’s mass m, the unstretched length of the rope L0, the height of the bridge above the water H, the spring constant of the rope, k, and the gravitational field strength, g.
a. How fast is she falling when she reaches the length of the unstretched rope?
b. Where is her acceleration maximum?

anonymous · Answer

c. The approximate values of the symbols for this case are:m=50kg,L0 =8m, H=150m,and g=10kg-m/s2. If the
elastic rope stretches an extra 4 m to bring her to a stop, what is its spring constant, k?

anonymous · Answer

I already figured out a and b, but c confuses me a lot.