An engine develops 10 kW of power. How much time will it take to lift a mass of 200 kg to a height of 40 m (`g=10(m)/(sec^2)`)`?

Options

A. 4s
B. 5s
C. 8s
D. 10s

Answer

C

Explanation

`P=(W )/( t ) `
or ` t= (W )/( P )= (mgh)/( P ) `
`= ( 200 xx 10 xx 40 )/( 10,000 ) =8s `