Calculate the average power of an electric crane which can lift 3000kg of coal per hour from a 300m deep coal mine. g=10ms^-2. Ch work and energy
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P = E/t
= mgh / t
= 3000 x 10 x 300 / 60 x 60
= 9 x 10^6 / 3600
= 2500 W
= mgh / t
= 3000 x 10 x 300 / 60 x 60
= 9 x 10^6 / 3600
= 2500 W
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