Question

An engine develops 10 kw of power. How much time will it take to lift a mass of 200 kg to height of 40 meter (g = 10 ms2)

Answer 1

Power = work / Time

work = m.g.h

Power = m.g.h / Time

10000 = 200(10)(40) / Time

1 = 2(4) / Time

Time = 8 hrs.