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Q.

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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a

RV

b

maV

c

(R+ma)V

d

(ma−R)V

answer is C.

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Detailed Solution

Force required to move with constant velocity ∴ Power = FVForce is required to oppose the resistive force R and also to accelerate the body of mass with acceleration a.∴ Power = (R+ma)V

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