How long can it take to reduce the speed of the car by 18 km / h if the acceleration of the car during braking is 2 m / s².

univerkov | July 17, 2021 | education

Data: ΔV – required speed change (ΔV = 18 km / h; in SI system ΔV = 5 m / s); a – acceleration (a = 2 m / s2).

To find out the time during which the specified car must reduce its speed, we use the formula: Vk = V0 – a * tx, from where we express: tx = (V0 – Vk) / a = ΔV / a.

Let’s perform the calculation: tx = ΔV / a = 5/2 = 2.5 s.

Answer: The time required to change the speed of the specified vehicle is 2.5 seconds.

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