1. The problem statement, all variables and given/known data A bungee jumper of mass 75 kg is standing on a platform 53m above the river. The length of the unstretched bungee cord is 11m. The spring constant of the cord is 65.5N/m. Calculate the jumpers speed at 19m below the bridge on the first fall. 2. Relevant equations Em1=Em2 Ek=1/2mv^2 Es=1/2kx^2 GPE=mgh 3. The attempt at a solution Find x by subtracting 11m from 19m which is 8m, this is how far the bungee cord is stretched. Use x in formula gpe=Ek+Es. Problem arises when I sub values in answer is off.