A crane of efficiency 80 % is used to lift 8000 kg of coal from a mine of depth 108 m. If the time taken by the crane to lift the coal is one hour, then the power of the crane (in kW ) is (Acceleration due to gravity =10 ~m ~s ⁻² )

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A crane of efficiency 80 % is used to lift 8000 kg of coal from a mine of depth 108 m. If the time taken by the crane to lift the coal is one hour, then the power of the crane (in kW ) is (Acceleration due to gravity =10 ~m ~s ⁻² )

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