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Power - needed to push the car through the air and overcome friction and the vehicle's mass.

Drag/Friction - everything from the air, driveline components, and tires create friction. A vehicle's shape is vital - a sleek sportscare with a low drag coefficient will slip through the air better than a refrigerator shaped SUV, and use less power to do so. Drag increases with the square of speed, so eventually more power will be required to move through the air (this is one of the reasons why fuel economy goes out the window when you speed).

Mass/weight - the heavier the vehicle, the more power is needed to move it from a standstill or uphill.

Gearing - shorter gear ratios will increase acceleration at the cost of top end speed. Taller ratios will have slower acceleration but a higher top end speed.

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Q: What are the factors involved in the speed of a car?
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