A engine is pulling a train of mass \( m \) on a level track at a uniform velocity (v). The resi...

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A engine is pulling a train of mass \( m \) on a level track at a uniform velocity (v). The resistive force
\( P \) offered by per unit mass is \( f \), then select incorrect

W statement-
(1) power produced by the engine is \( \mathrm{mfv} \)
(2) the extra power developed by the engine to maintain a speed \( \mathrm{v} \) up a gradient of \( \mathrm{h} \) in \( \mathrm{s} \) is \( \frac{\text { mghv }}{\mathrm{s}} \)
(3) the frictional force exerting on the train is \( \mathrm{mf} \) on the level track
(4) none of above
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