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It varies with your initial speed, and formulas can become complicated if other-than-average car weight, payload, road and weather conditions etc. start to play a role. In normal weather and road conditions the simple formula is: divide your initial speed by ten, multiply the outcome with itself and finally divide that outcome by two. So driving at 90 km/h gives a breaking distance of 90 ./. 10 = 9 x9 = 81 ./.2 = 40.5 meters. Only, before you actually hit the brakes your reflexes will take another second of driving at full speed to kick in. That will add (at 90 km/h) another 25 meters to your breaking distance, making it 65.5 meters to a full stop.
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