When the brake is applied, the vehicle acceleration module is 1.4 m / s2. At what distance from an obstacle should

When the brake is applied, the vehicle acceleration module is 1.4 m / s2. At what distance from an obstacle should the driver start braking if the car was driving at 60 km / h?

These tasks: a (vehicle acceleration module when the brake is applied) = 1.4 m / s2; V0 (speed before braking) = 60 km / h (in SI system V0 = 16.67 m / s).
The minimum distance to the obstacle at the start of braking is determined by the formula: S = (V0 ^ 2 – V ^ 2) / 2a.
Let’s perform the calculation: S = (16.67 ^ 2 – 0 ^ 2) / (2 * 1.4) = 99.2 m.
Answer: The driver must start braking no closer than 99.2 meters to the obstacle.