Q.

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

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a

R v

b

m a v

c

(R+mo) v

d

(mo-R)v

answer is C.

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Detailed Solution

W=F×v=(R+ma)v
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A car of mass m is driven with acceleration a along a straight level road against a constant external resistivity force R. When the velocity of car is v, the rate at which the engine of the car is doing work will be