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An engine is hauling a train of mass m o...

An engine is hauling a train of mass `m` on a level track at a constant speed `v`. The resistance due to friction is `f`. What power is the engine producing? What extra power must the engine develop to maintain the speed up a gradient 1 in l. What is the new total power developed by the engine develop to maintain the speed up a gradient 1 in l. What is the new total power developed by the engine ?

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