physics
posted by jena .
A freight train has a mass of 3.2 × 107 kg.
If the locomotive can exert a constant pull
of 7.1 × 105 N, how long would it take to
increase the speed of the train from rest to
74.6 km/h? (Disregard friction.)

change the speed to m/s
F=ma
F=m (change in velocity/time)
F=m * Vfinal/time
solve for time.
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