[ Physics ] Open Question : A bungee jumper with mass 63.0 kg jumps from a high bridge. After reaching his lowest point, he oscillates up?

A bungee jumper with mass 63.0 kg jumps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times in 35.0 s. He finally comes to rest 23.0 m below the level of the bridge. Calculate the spring stiffness constant of the bungee cord. N/m Calculate the unstretched length of the bungee cord. m