First slide
Power
Question

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 

Moderate
Solution

Force required to move with constant velocity 
 Power = FV
Force 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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