Having started braking with an acceleration of 0.5m / s2, the train went to a stop 225m. Determine the braking time.

These tasks: a (acceleration with which the train under consideration began braking) = 0.5 m / s2; S (distance traveled to stop) = 225 m.

The braking time of the train under consideration can be expressed from the formula: S = a * t ^ 2/2, whence t = √ (2 * S / a).

Let’s perform the calculation: t = √ (2 * 225 / 0.5) = √900 = 30 s.

Answer: The train moved to a full stop for 30 seconds.