A train consists of 4300kg locomotive pulling two loaded boxcars. The first boxcar has a mass of 12,700 kg and the second 16,300 kg. The acceleration of the train is .580m/s^2.
(A) with what force in newtons do the boxcars pull on each other?
(B) with what force N do the locomotive and first boxcar pul on each other
(C) with what force must the tracks push on the locomotive?