Quizzes & Puzzles1 min ago
stopping distances
does anyone know a formula for working out stopping distances?
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For more on marking an answer as the "Best Answer", please visit our FAQ.Speed (in mph) squared, divided by 20. Then add speed in mph. This gives you the stopping distance in feet.
For example, from 70mph:
70 x 70 = 4900
Divided by 20 = 245
Plus 70 = 315 feet.
The mph squared part of the formula represents the braking distance and the additional bit (the plus 70 in my example) is the "thinking" distance.