A 150lb person hangs from a helicopter hovering 100ft off the ground from a rope that weighs 21b/ ft. The person is initially 10ft from the helicopter (i.e. they are hanging from 10ft of rope). a) Compute the work done by the force of gravity when the person is lowered to a height 10ft above the ground. b) Compute the work done by the force of gravity if the person lets go and the rope is released from the helicopter (i.e. both fall to the ground)