Tarzan, whose mass is 100 kg, is hanging at rest from a tree limb. Then he lets go and falls to the ground. Just before he lets go, his center of mass is at a height 2.9 m above the ground and the...

Tarzan, whose mass is 100 kg, is hanging at rest from a tree limb. Then he lets go and falls to the ground. Just before he lets

go, his center of mass is at a height 2.9 m above the ground and the bottom of his dangling feet are at a height 2.1 above the

ground. When he first hits the ground he has dropped a distance 2.1, so his center of mass is (2.9 − 2.1) above the ground.

Then his knees bend and he ends up at rest in a crouched position with his center of mass a height 0.5 above the ground.

(a) Consider the point particle system. What is the speed v at the instant just before Tarzan's feet touch the ground?

(b) Consider the real system. What is the net change in internal energy for Tarzan from just before his feet touch the

ground to when he is in the crouched position?