Homework Help: physics

Posted by scott on Saturday, November 3, 2012 at 4:06pm.

A freight train has a mass of 3.1 × 107 kg.
If the locomotive can exert a constant pull
of 4.9 × 105 N, how long would it take to
increase the speed of the train from rest to
71.9 km/h? Disregard friction.

physics - Henry, Monday, November 5, 2012 at 7:46pm
a=F/m=4.9*10^5 / 3.1*10^7=0.0158 m/s^2.

V = 71.9km/h = 71900m/3600s = 20 m/s.

t = (V-Vo)/a = (20-0)/0.0158 = 1265.8 s.
= 21 min.

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