A car of mass 1000 kg rests on a horizontal
road initially. It is then pushed over 5 m to a
speed of 1 m s-l before the engine is started. If
the average frictional force acting on the car is
500 N, the total work done in moving the car
before the driver starts the engine, is
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case 1: The car is pushed from rest to a speed of 1m/s over a distance of 5 m. So the car is accelerated during this push. Work done in moving the car is against the friction force. Since the car is pushed at a uniform speed, the force exerted is equal to the friction force.
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