In case of emergency driving, the car moving at a speed of 108 km, stopping after 10 seconds, find the braking distance.

univerkov | May 22, 2021 | education

Initial data: V1 (speed of the considered vehicle before emergency braking) = 108 km / h (in SI V1 = 30 km / h); t (emergency braking time) = 10 s.

We calculate the braking distance of the car under consideration by the formula: S = (V2 ^ 2 – V1 ^ 2) / 2a = (0 – V1 ^ 2) / (2 * (-V1 / t)) = V1 ^ 2 * t / 2V1 = V1 * t / 2.

Let’s calculate: S = 30 * 10/2 = 150 m.

Answer: The braking distance of the car in question is 150 meters.

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