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Posted by on Wednesday, February 17, 2010 at 8:53pm.

A freight train has a mass of 1.9 107 kg. If the locomotive can exert a constant pull of 7.5 105 N, how long does it take to increase the speed of the train from rest to 90 km/h in minutes?

  • physics - , Thursday, February 18, 2010 at 6:24am

    V = 90 km/h = 25 m/s
    a = acceleration rate = F/m = 0.0395 m/s^2

    time = V/a = 633 seconds = ___ minutes

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