A freight train consists of two 8.00x104 kg engines and 45 cars with average masses of 5.50x104 kg.  What force must each engine exert backward on the track to accelerate the train at a rate of 5.00x10-2 m/s2 if the force of friction is 7.50x105 N, assuming the engines exert identical forces?
Group of answer choices
882 kN
441 kN
221 kN
110 kN

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