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10 July, 22:54

A box weighing 100 n is pushed up an incline plane that is 5 m long. It takes a force of 75 n to push it to the top, which has a height of 3m. Find the efficiency

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  1. 11 July, 00:52
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    0.8

    Explanation:

    Work = force * distance

    W = Fd

    W = 75 N * 5 m

    W = 375 J

    Potential energy = weight * height

    PE = mgh

    PE = 100 N * 3 m

    PE = 300 J

    Efficiency = energy out / energy in

    e = 300 J / 375 J

    e = 0.8

    The efficiency is 0.8, or 80%.
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