The car was moving along the highway at a speed of 90 km / h. It took him 50 seconds to stop completely.

The car was moving along the highway at a speed of 90 km / h. It took him 50 seconds to stop completely. With what acceleration did the braking take place? Find the path of the car to the stop.

Task data: V1 (road speed, initial speed) = 90 km / h (in SI V1 = 25 m / s); t (time required to stop) = 50 s.

1) Acceleration with which the vehicle was decelerated: a = (V2 – V1) / t = (0 – 25) / 50 = -0.5 m / s2.

2) The path of this car to a complete stop: S = (V2 + V1) * t / 2 = (0 + 25) * 50/2 = 625 m.

Answer: The vehicle was braking with an acceleration of -0.5 m / s2; the distance covered is 625 meters.