Question

9. An engine is pulling a train of mass m on a level track at a uniform speed v. The resistive fa
offered per unit mass is f.
(A) Power produced by the engine is mfv.
(B) The extra power developed by the engine to maintain a speed v up a gradient of h in
mghv
S
(C) The frictional force exerting on the train is mf on the level track
(D) None of above is correct​

Answer 1

Answer:

(A) Power produced by the engine is mfv.

Explanation:

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