(a) How much work ...?

Question

(a) How much work does an elevator motor do to lift a 920 kg elevator a height of 84 m?
J
(b) How much power must the motor supply to do this in 44 s at constant speed?
W

Answer 1

Work is the scalar product of force and distance. In this problem, just multiply the force (mg) by the distance h.

Power is work divided by time. Take your answer from above and divide by the time to get power.