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120ft.

I discovered a formula for calculating it for any given speed. I've tested it for 20mph, 30mph,40mph,50mph,60mph and 70mph. The formula is as follows:

overall stopping distance in ft = Sp x (1 + Sp/20).

Where Sp is the magnitude of the speed in mph.

So at 40mph it is:

40 x (1 + 40/20) = 50 x (1 + 2) = 40 x 3 = 120ft.

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13y ago

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Q: What is the typical overall stopping distance at 40mph?
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