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Question

(C) The power $P$ delivered by the engine is given by the product of the force $F$ exerted by the engine and the velocity $V$ of the car,i.e.,$P = FV$

Vedclass · Accepted Answer

$(R + ma)V$

Vedclass · Answer

(C) The power $P$ delivered by the engine is given by the product of the force $F$ exerted by the engine and the velocity $V$ of the car,i.e.,$P = FV$.According to Newton's second law,the net force $F_{net}$ acting on the car is $F_{net} = ma$.The forces acting on the car are the engine force $F$ (forward) and the resistive force $R$ (backward).Therefore,$F - R = ma$,which gives the engine force $F = R + ma$.Substituting this into the power formula,we get $P = (R + ma)V$.

$A$ car of mass $m$ is driven with acceleration $a$ along a straight level road against a constant external resistive force $R$. When the velocity of the car is $V$,the rate at which the engine of the car is doing work will be

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