1. The problem statement, all variables and given/known data Mass of person jumping off bridge = 60 kg The bridge is 60m above the river The cord only starts stretching after he falls 20m. k = 50 N/m 2. Relevant equations gravitational potential energy = mgh elastic potential energy = (1/2)kx^2 3. The attempt at a solution So this problem is asking how far below the bridge the person will fall before coming to a stop (before he bounces back up). I did mgh = (1/2)kx^2 which is 36000J = (1/2)(50)(x^2) and got x = 38m. Can someone verify whether this is right? (As in did I set up the problem properly). But my real question is for the second part. He bounces up and down a few times but eventually due to air friction he hangs at rest. At what height above the water is he then? I'm not sure what I'm supposed to do exactly do to find this. Can someone offer hints?