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[–] matthew-- 0 points 6 points (+6|-0) ago 

No sure. But I assume they took the time stamp for two similar pictures. Estimated the distance the car travelled, then divided that by the difference in time.

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[–] 15418570? 0 points 3 points (+3|-0) ago 

That's how fit would do it. Then you can just assume linear change in speed or try to model the real world breaking behavior which doesn't fall exactly linear

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[–] matthew-- 0 points 1 point (+1|-0) ago 

It depends on the time difference between the two points. If it's only half a meter, then it's not too far off.

There are also simple empirical formulas for estimating this stuff. At least, there are for aircraft.

But yes, the braking is not linear.