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26 March, 00:50

A man weighting 600N runs up the hill. It takes him 20s to reach top which is 15m from ground. Calculat

A) a work he has done

B) the power output his legs

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  1. 26 March, 01:10
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    A) 9000 Joules

    B) 450 Watts

    Explanation:

    Work equals change in energy:

    W = ΔPE

    W = mgΔh

    W = (600 N) (15 m)

    W = 9000 J

    Power is work per time:

    P = W/t

    P = (9000 J) / (20 s)

    P = 450 W
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