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29 September, 21:04

Calculate the work done by an 85.0-kg man who pushes a crate 4.00 m up along a ramp that makes an angle of 20.0° with the horizontal (see below). He exerts a force of 500 N on the crate parallel to the ramp and moves at a constant speed. Be certain to include the work he does on the crate and on his body to get up the ramp.

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  1. 29 September, 21:21
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    Answer: Given mass of man = 85kg

    Distance crate was pushed = 4m

    Force exerted on crate = 500N

    Angle inclined = 20°

    Let Total force exerted Ft = (mg * sin (20)) + 500

    Ft = (85*9.81 * sin20°) + 500

    Ft = 758N

    Work done Wd = Ft * distance

    Wd = 785 * 4 = 3.14 * 10^3J
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