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6 June, 11:01

A crane motor exerts 3,500 W to lift a load up 5 floors in 25 seconds. How much work did the crane do?

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  1. 6 June, 13:13
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    Answer: 87500J

    Explanation:

    Given that,

    Power exerted by crane = 3,500 W

    Time taken = 25 seconds

    work done by crane = ?

    Since power is the rate of work done per unit time, then power is workdone by the crane divided by the time taken.

    i. e power = work / time

    3,500 W = work / 25 seconds

    Work = 3500W x 25 seconds

    Work = 87500J

    Thus, 87500 joules of work was done by the crane.
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