A bungee jumper with mass 0.63 kg jumps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a lowpoint eight more times in 35.3 s. He finally comes to rest 29.0 mbelow the level of the bridge. Calculate the spring stiffnessconstant of the bungee cord. Also, calculate the unstretched length of the bungee cord.