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The weight of a train is 3000 metric tons. The coefficient of friction is 0.02.

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The weight of a train is 3000 metric tons. The coefficient of friction is 0.02. What should be the tractive force of the locomotive to give the train a speed of 60 km/hr in 2min after starting? 

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 Answer: F = 103 ton-wt.

Explanation:

An impulse Ft is given the train during the time t by the tractive force F of the locomotive and an impulse — kPt, by the force of friction. According to Newton's second law

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