A machine is driven by a 100 kg mass that falls 8.0 m in 4.0 s. It lifts a load of mass 500 kg vertically upwards. (a) what is force of newton, exerted by the falling mass? (b) what is the work done by the 100 kg mass falling through 8 m? (c) what is the power input to the machine? (d) if the efficiency of the machine is 75%,what is the power output? (e) what is the work done by the machine in 4.0 s?