Tarzan has a mass of 100 kg and from rest swings from the cliff by rigidly holding on to...

Tarzan has a mass of 100 kg and from rest swings from the cliff by rigidly holding on to the tree vine, which is ED in measured from the supporting limb A to his center of mass. Determine his speed just after the vine strikes the lower limb at B. Also, with what force must he hold on to the vine just before and just after the vine contacts the limb at B?