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

R V

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m a V

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(R + m a) V

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(m a - R) V

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Solution

The correct option is C $(R + m a) V$
Total force require to oppose the resistive force and move with acceleration a is,
$F = m a + R$
Power is given by,
$∴ P = (m a + R) V$

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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

The correct option is C (R+ma)VTotal force require to oppose the resistive force and move with acceleration a is, F=ma+RPower is given by,∴P=(ma+R)V

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

The correct option is C $(R + m a) V$
Total force require to oppose the resistive force and move with acceleration a is,
$F = m a + R$
Power is given by,
$∴ P = (m a + R) V$