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What is the power of an engine which can...

What is the power of an engine which can lift 20 metric tonne of coal per hour from a `20-m` deep mine?

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Mass, `m=20` metric ton `=20xx1000kg`, distance, `S=20m`, time,
`t=1h=3600s`
`Power=(Work)/(Time)=(mgxxs)/(t)=(20xx1000xx10xx20)/(3600)W`
`=1.1xx10^3W`
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