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  4. 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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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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Solution:

Total force require to oppose the resistive force and move with acceleration a is,
F=ma+R
Power is given by,
∴