The braking distance of a car traveling at a speed of 72 km per hour is 50 m. How long braking lasted.
| August 7, 2021 | education
Problem data: V0 (speed with which the considered car was traveling, initial speed) = 72 km / h (20 m / s); S (braking distance) = 50 m.
The braking time of the vehicle in question can be expressed from the formula: S = V0 ^ 2 / 2a = V0 ^ 2 / (2 * V0 / t) = V0 * t / 2, whence t = 2S / V0.
Calculation: t = 2 * 50/20 = 5 s.
Answer: Braking of the car in question lasted 5 seconds.
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