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25 May, 23:50

A 60 kg box is lifted by a rope a distance of 10 meters straight up at constant speed. how much power is required to complete this task in 5 seconds?

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  1. 25 May, 23:55
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    Power=Work/Time

    The work done is the energy required to lift the box, fighting the force of gravity. So, Work=Potential energy of the box at 10 meters.

    W=PE=mgh = (60) (9.8) (10) = 5880J

    Finally,

    P=W/T = (5880) / (5) = 1176Watt

    So the answer is 1176 Watts
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