A car of mass 500 kg is driven with acce...

A car of mass 500 kg is driven with acceleration 1 `m//s^(2)` along straight level road against constant external resistance of 1000 N. When the velocity is `5 m//s` the rate at which the engine is working is :

5 kW

7.5 kW

2.5 kW

10 kW

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