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March 28, 2017

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A boy whose mass is 40kg runs up a flight of 30 steps each 150mm high in 6seconds. Find the average power developed (take g as 10m/s^2.

  • Physics - ,

    work done = m g h = 40 * 9.81 * 30 * 0.150 Joules

    power in Watts = work done / 6 seconds

  • Physics - ,

    g=a=10m/s^2,

    M=40kg,

    S=150mm/1000=0.15m*30steps each=4.5m,

    F=ma=40*10=400N


    .'. Power=W/t=F*s/t=F*V=1800/6 = 300W Ans// or 0.3kW Ans//

  • Physics - ,

    0.3kw

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