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=m (change in velocity/time)
F=m * Vfinal/time
solve for time.