An engine is pulling a train of mass `m` on a level track at a uniform speed `u`. The resistive froce offered per unit mass is `f`.
A
power produced by the engine is mfu
B
the extra power developed by the engine to maintain a speed v up a gradient of h in s is `(mghv)/(s)`
C
the frictional force exerting on the train is mf on the level track
D
none of above
Text Solution
Verified by Experts
The correct Answer is:
D
Total resistive force=mf `rArr` power =fv=mfv Extra power required= `(mg sin theta)v=(mghv)/(s)`
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