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**Physics, Astronomy & Cosmology / Re: Why does double the velocity double the momentum and quadruple the KE?**

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**Today**at 16:10:56 »

statistically (and there is no shortage of statistics) the probability of fatality correlates with the square of the closing speed.But as this thread has shown (to everybody but the deniers), closing speed with a wall is worse than the same closing speed with a similar mass vehicle or say a fire hydrant. There's more to it that just the one factor.

Apples to apples, it is a very loose correlation indeed. A crash into a wall by a typical passenger car at a closing speed of say 160 km/hr has almost identical probability of fatality as one at twice that speed. Nothing near 4x the probability. A quadratic curve cannot correlate with a curve confined by a finite range, except over a limited portion of the curves.

I picked 160 because it's about as fast as I've ever driven, with a diesel car no less. In my mirror I spotted another car who shortly blew by me like I was standing still. I guess it was an optimal road for that sort of thing.