A “bungee jumper” who weighs 160 lb leaps from a bridge above a river. The bungee cord has...

A “bungee jumper” who weighs 160 lb leaps from a bridge above a river. The bungee cord has an unstretched length of 60 ft. and it stretches an additional 40 ft before the jumper rebounds. Model the cord as a linear spring. When his motion has nearly stopped, what are the period and frequency of his vertical oscillations? (You can’t model the cord as a linear spring during the early part of his motion. Why not?)