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Originally Posted by rayxi
What you are missing from your analysis is the drag coefficient and that fact that the car would reach terminal velocity rather than continue accelerating at 9.81 m/s2. I have no idea what the drag coefficient is of a car falling wheels first but I'm guessing the terminal velocity is <75m/s. So while it is possible it isn't all that impressive.
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You're right. A car falling wheels first would produce a heck of a lot of drag and would hit its terminal velocity pretty quickly and would not be going particularly fast. I'm guessing it probably wouldn't even hit 100 mph, but that's just my guess.