Quote Originally Posted by IDCoconut
If it's the same car, with the same amount of power, same gearing, and same wheels and tires, but with a difference of a fatass in one and a lindsey lohan on the other, then the lighter car wins. The only difference is the heavier car has more momentum at the same speed compared to the lighter car, meaning it will be harder to stop.

Don't think free-fall here. That's just one factor. Your car's acceleration is a BIG factor and a lighter car with the same amount of power and gearing as another will always accelerate faster. Considering you have 2 "perfect" drivers.
Actually in a free fall they would fall at the same rate (in a vacuum where there is no friction, wind, etc.) b/c gravity pulls everything toward the center of the earth at the same rate; 9.8 m/s.