A heavy rope, 50 ft long, weighs 0.5 lb/ft and hangs over the edge of a building 120 ft high.

(a) How much work is done (in ft-lb) in pulling the rope to the top of the building?

Work done = ft-lb

(b) How much work is done (in ft-lb) in pulling half the rope to the top of the building?

Work done = ft-lb