How long will the car braking last at an initial speed of 72 km / h and an acceleration of 2.5 m / s2.
| September 3, 2021 | education
Task data: V1 (speed of a given vehicle before braking) = 72 km / h (in SI V = 20 m / s); a (acceleration rate) = 2.5 m / s2.
The duration of braking of a given vehicle is expressed from the formula: V2 = 0 = V1 – a * t, whence t = V1 / a.
Let’s make a calculation: t = 20 / 2.5 = 8 s.
Answer: Deceleration of the given vehicle will last 8 seconds.
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