A 68.0-kg bungee jumper is standing on a tall platform (L0 = 46.0 m), as indicated in the figure. The bungee cord has a natural length of L0 = 9.00 m and, when stretched, behaves like an ideal spring with a spring constant of k = 66.0 N/m. The jumper falls from rest, and it is assumed that the only forces acting on him are his weight and, for the latter part of the descent, the elastic force of the bungee cord.
Concepts: (i) Can we use the conservation of mechanical energy to find his speed at any point along the descent? Explain your answer.
(ii) What type of energy does he have when he is standing on the platform?
(iii) What types of energy does he have at point A?
(iv) What types of energy does he have at point B? Calculations: What is his speed when he is at the following heights above the water:
(a) hA = 37.0 m,
(b) hB = 15.0 m?

Transcribed Image Text:

Lg 9.00 m h46.0 m A 37.0 m B h15.0 m