Question

A crane lifts a mass of 100 kg to a height of 10 m in 20 s. The power of the crane is (Take `g = 10 m s^(-2)`)
A. 100 W
B. 200 W
C. 250 W
D. 500 W

Answer 1

Correct Answer - D
Here, m= 100 kg, h = 10 m, t=20 s, `g= 10 m s^(-2)`
The power of the crane is
`P= (mgh)/t= ((100 kg)(10ms^(-2)) (10m))/((20 s))= 500W`