Physics - weight lifter lifts a 400-N set of weights from ground level to a position over his head?

 weight lifter lifts a 400-N set of weights from ground level to a position over his head, a vertical distance of 1.95 m. How much work does the weight lifter do, assuming he moves the weights at constant speed?

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  • oubaas
    Lv 7
    2 months ago

    Work W = m*g*Δh = 400*(1.95-0) = 780 joule 

  • Ash
    Lv 7
    2 months ago

    W = ΔPE = PE(final) - PE(initial) = mgh - 0 = (400 N)(1.95 m) = 780 J

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