The train moves at a speed of 72 km / h, brakes and stops after 200 meters. Find the braking time?

Since the movement of the train is uniformly accelerated, or rather uniformly slowed down, and the speed at the end is 0, because the train has stopped, then the equality is true:
s = V ^ 2 / 2a
a = 2S / V ^ 2 = 400/5184 = 0.077m / s ^ 2
t = 2V / a = 144 / 0.077 = 1870c

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