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5. A freight train has a mass of 1.5 x 10' kg. If the locomotive can exert a constant pull of 7.5 x 105 N, (a) what is the train's acceleration and (b) how long does it take to increase the speed of the train from rest to 80. Km/h ? answers ax = 0.050 m/s and t = 440 seconds First convert 80. Km/h to meters/second The locomotive's pull is a force (notice it is given in Newtons) Use F=ma to find the acceleration Once you know the acceleration, then use an equation of motion to find the time = Draw all the Draw all forces the ma's