During emergency braking, the vehicle moves with an acceleration of 4 m / s2.

During emergency braking, the vehicle moves with an acceleration of 4 m / s2. Find the braking distance of the car at a speed of 72 km / h

To determine the distance traveled by a given vehicle during emergency braking, use the formula (slow motion): S = (V0 ^ 2 – V ^ 2) / 2a.

The value of the variables: V0 – speed before emergency braking (V0 = 72 km / h; in SI V0 = 20 m / s); V – final speed (V = 0 m / s); a – acceleration (a = 4 m / s2).

Let’s perform the calculation: S = (V0 ^ 2 – V ^ 2) / 2a = (20 ^ 2 – 0) / (2 * 4) = 50 m.

Answer: The braking distance is 50 m.