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A 1000 kg engine pulls a train of 4 wago...

A 1000 kg engine pulls a train of 4 wagons each of 2500 kg along a horizontal railway track . If the engine exerts a force of 50000 N on wagons and track offers force of friction 10000 N, then calculate
(i) The net accelerating force
(ii) The acceleration of the train
(iii) The force of wagon -1 on wagon - 2

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