A train of mass M is driven with acceleration 'a' along a straight level track against a constant external resistance R. When the velocity of the train is v, the rate at which the engine of the train is doing work will be

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Mav

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(R + Ma)v

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(Ma - R)v

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Solution

The correct option is C (R + Ma)v
Force applied by engine $= M a + R$
and Power, $P = F . v$
=> $P = (M a + R) . v$

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A train of mass M is driven with acceleration 'a' along a straight level track against a constant external resistance R. When the velocity of the train is v, the rate at which the engine of the train is doing work will be

The correct option is C (R + Ma)vForce applied by engine =Ma+Rand Power, P=F.v=> P=(Ma+R).v

The correct option is C (R + Ma)v
Force applied by engine $= M a + R$
and Power, $P = F . v$
=> $P = (M a + R) . v$