Physics FTW. Air resistance is a force. Any force that acts upon an object will cause it to accelerate. In this particular case, air resistance does actually slow the car down. The faster the car goes, the greater the force against the car. Without friction/air resistance/restrictive forces, anything with a force acting upon it will accelerate infinitely. [sigma]F=ma (net force=mass x acceleration) With one force and a constant mass, something would accelerate forever to an infinite speed.
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