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JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Power

  • question_answer
    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 [MP PMT/PET 1998; JIPMER 2000]

    A)             RV      

    B)             maV

    C)             \[(R+ma)V\]

    D)               \[(ma-R)V\]

    Correct Answer: C

    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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