- #1

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- 9

I'm working on my highway code and my book give me the approximate formula and the real formula of the braking distance. Here's the real formula according to the book :

$$ Bd = \frac{V^2}{254 \times f} $$

With :

V : the velocity

f : the adherence coefficient.

But I have on question. Where does this 254 come from ?

Thanks in advance.

Regards

Hugo