Posted by Kourt on Thursday, February 3, 2011 at 9:32pm.
The net force is zero.
The engine does work on the car, by applying a torque to the drive shaft. The work is necessary to overcome aerodynamic and internal (engine and bearing) friction.
The road applies a force to the tires to keep the car moving forward, but the road does not do work. The work is generated internally by the engine.
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