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That all depends upon the deceleration the car experiences.

The more braking there is, the greater the deceleration and the shorter the stopping time.

In the UK Highway Code, travelling at 15 mph under emergency braking it would take 15/22 ≈ 0.68 seconds for the thinking plus 15×3/44 = 1 1/44 ≈ 1.02 seconds for the actual stopping, a total of 1 31/44 ≈ 1.70 seconds (covering 15 + 11¼ = 26¼ ft).

Note that these figures have not been updated in years, but the braking of cars has improved, so you should be able to stop in less time.

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Q: If a car is traveling 15 mph how many seconds would it take to stop?
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