A daring friend of yours talks you into bungee jumping from theRoyal Gorge Bridge, in Colorado. Starting from the bridge (atrest), you launch off and fall first to the unstretched length ofthe bungee, 153 m. The bungee then stretches until you reach thefull drop distance of 321 m. For this problem, approximate yourmass as 70 kg.

a. What is the energy stored (or lost) by the bungee?

b. After you drop the full distance, you bounce back up to 50 mbelow the launch point. How much energy was lost (to air frictionand heat) in the first drop?