The engine of a locomotive exerts a constant force of 8.5 105 N to accelerate a train to 90 km/h. Determine the time (in min) taken for the train of mass 1.5 107 kg to reach this speed from rest.
a = f / m = 8.5E5 /1.5E7
time = velocity / acceleration
the answer is in minutes , so you'll have to convert some units