posted by Anonymous .
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?
V = 90 km/h = 25 m/s
a = acceleration rate = F/m = 0.0395 m/s^2
time = V/a = 633 seconds = ___ minutes