How long can it take to stop a car moving at a speed of 72 km / h if the acceleration during braking is 5 m / s2?

univerkov | June 14, 2021 | education

To find out the required braking duration of the presented car, consider the formula: tx = (Vn – Vk) / a = (Vn – 0) / a, where Vn is the initial speed of the presented car (Vn = 72 km / h = 20 m / s); a – acceleration during deceleration (a = 5 m / s2).

Let’s perform the calculation: tx = Vn / a = 20/5 = 4 s.

Answer: You can stop the presented car in 4 seconds.

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