Is there any net work done by external forces on a car moving with constant speed along a straight road?

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Solution

Work done is defined as the product of force causing displacement of an object and the displacement of an object in the direction of the force.
Work done is directly proportional to both the force and displacement.
When a car is moving at a constant speed it means that the car is moving at the same average speed therefore no external forces will be acting on the car.
No, when a car is moving with constant speed on a straight road net-work done by external forces will be zero.

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