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A freight train has a mass of 5 x 107 kg. If the locomotive can exert a constant pull of 12 x 105 N, how long would it take to increase the speed of the train from rest to 85 km/h

  • physics -

    m=5*107 kg
    F=12*105 N
    a=F/m m/s²
    Time, t, to reach 85 km/h = V m/s (conversion required)
    t=V/a seconds

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