Consider a bungee cord of unstretched length L0 = 36 m. When the cord is stretched to L > L0 it behaves like a spring and obeys Hooke’s law with the spring constant k = 27 N/m. However, unlike a spring, the cord folds instead of becoming compressed when the distance between its ends is less than the unstretched length: For L < L0 the cord has zero tension and zero elastic energy. To test the cord’s reliability, one end is tied to a high bridge (height H = 160 m above the surface of a river) and the other end is tied to asteelballofweightmg=72kg×9.8m/s . The ball is dropped off the bridge with zero initial speed. Fortunately, the cord works and the ball stops in the air before it hits the water and then the cord pulls it back up. Calculate the ball’s height hbot at the lowest point of its trajectory. For simplicity, neglects the cord’s own weight and inertia as well as the air drag on the ball and the cord. Answer in units of m.