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7. A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg,along a horizontal track. If the engine exerts a force of 40000 Nand the track offers a friction force of 5000 N, then calculate(a) the net accelerating force;(b) the acceleration of the train; and(c) the force of wagon 1 on wagon 2.

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