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/s²) (a) 19.6 W (b) 39.2 W (c) 19.6 kW (d) 39.2 kW

Answer: (c). Power P = W/t = mgh/t. P = (1000 × 9.8 × 20)/(10) = 19600 W So the answer is (c) 19.6 kW.

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Power

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

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Answer: (c)

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