The power of a crane, which lifts a mass of 1000 kg to a height of 20 m in 10 s is : ( g = 9.8 m/s ^2 )

Step-by-step solution

Given m = 1000 kg, h = 20 m, t = 10 s, g = 9.8 m/s ^2 . Work done by the crane is W = mgh . W = 1000 9.8 20 = 196000 J. Power is the rate of doing work, P = W t . P = 196000 10 = 19600 W. P = 19.6 kW. Answer: 19.6 kW