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 $^2$ )

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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 )

Quantrex Academy · Accepted Answer

Correct answer: C. 19.6 kW

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

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