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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
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
The correct option is C
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
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