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Oh Snapping Turtle (oh snap)
So, evidently the force on the car due to wind is proportional to the SQUARE of the velocity! What the crap, yo. Why is that? Hmm... Maybe because the force is acting on an area. Whatever. So, it's more accurate to write
F(v) = p + q*v*v for the force on the car due to wind and rolling resistance.
Still, you can just choose speeds v1 and v2, find F(v1) and F(v2) by the deceleration experiment above, and then solve for p and q.
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