A freight train has a mass of 4.78 * 10^7 kg. the locomotive provides a force of 1.3 * 10^6 N and the brakes provide a force of -3.2 * 10^3 N.
1. How long will it take for the train to accelerate to it's maximum speed of 15 m/s?
2. The train accidentally stumbles into an action thriller movie where the bad guys have blown up the bridge 750 m ahead. Will the train be able to stop in time?
a. vf=vi+at where a=force/mass
solve for time t
b. vf^2=vi^2+2ad where a=brakingforce/mass