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jorden
jorden asked in Science & MathematicsPhysics · 3 years ago

when exerting a steady pull of 450 N, a lorry travels at 80 km/h. Calculate A) the work done in 15 min and b) the power required?

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  • oubaas
    Lv 7
    3 years ago
    Favorite Answer

    power P = F*V = 450/3.6*80 = 10,000 watt

    work = 15*60*P/1000 = 9,000 kjoule...or 9.00 Mjoule

  • billrussell42
    Lv 7
    3 years ago

    work = force x distance

    distance = 80 km/hr x (1/4) hr = 20 km = 20000 m

    work = 450 x 20000 = 9000000 J = 9 MJ

    power = joules per second

    P = 9 MJ / (15 min x 60s/min) = 10 kW

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