The train moves at a speed of 20 m / s, braking to a full stop, it came to a distance of 200 m.

The train moves at a speed of 20 m / s, braking to a full stop, it came to a distance of 200 m. The time during which the braking took place.

To determine the braking time for a given train, we apply the formula: S = (V + V0) * t / 2.

Let us express the braking time: t = 2 * S / (V + V0).

Let’s write down the designation of the variables: S – distance traveled (S = 200 m); V – final speed (V = 0 m / s); V0 – initial speed (V0 = 20 m / s).

Calculation: t = 2 * S / (V + V0) = 2 * 200 / (0 + 20) = 20 s.

Answer: The target train stopped after 20 seconds.