A crane lifts a container of mass 2500 kg through a vertical height of 12 m in 30 s. What is the power developed by the crane?
[g = 10 N/kg]

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Question

A crane lifts a container of mass 2500 kg through a vertical height of 12 m in 30 s. What is the power developed by the crane?
[g = 10 N/kg]

Accepted Answer

10 000 W — Award 1 mark for correct calculation: Weight = 2500 × 10 = 25 000 N; Work done = 25 000 × 12 = 300 000 J; Power = 300 000 ÷ 30 = 10 000 W. A is incorrect — this results from dividing force by time without calculating work. C is incorrect — this confuses work done with power or miscalculates. D is incorrect — this is the work done in joules, not the power in watts.

Answer

30 000 W

Answer

300 000 W

Answer

10 000 W

Answer

1000 W

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