# When braking, the car moves with an acceleration of 5 m / s2. At what minimum distance from an obstacle

When braking, the car moves with an acceleration of 5 m / s2. At what minimum distance from an obstacle should the driver start braking if the vehicle speed is 20 m / s?

The distance traveled by the car during braking can be calculated by the formula: S = (V ^ 2 – V0 ^ 2) / 2a, where V is the final speed of the car (V = 0 m / s), V0 is the initial speed of the car (V0 = 20 m / c), a is the acceleration of the car when braking (a = – 5 m / s ^ 2, “-” – the car is moving equally slowly). Let’s calculate the distance traveled during braking: S = (0 ^ 2 – 20 ^ 2) / 2 (- 5) = 400/10 = 40 m.
Answer: The minimum braking distance is 40 m.

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