1. The problem statement, all variables and given/known data A frieght train has a mass of 1.5x10^7 kg. The wheels of the locomotive push back on the tracks with a constant net force of 7.5X10^5N, so the tracks push forward on the locomotive with a force of equal magnitude. (ignore aerodynamics and friction) how long would it take to increase the speed of the train from rest to 80km/h? 2. Relevant equations 3. The attempt at a solution So far I was able to calculate the acceleration: a=F/m a=7.5*10^5/1.5*10^7 a=5*10^12m/s^2 am I going in the right direction and how would I proceed?