The train was moving at a speed of 72 km / h. Find the braking time if it is known that the braking distance was 800 m.
| March 4, 2021 | education
Given: V0 (initial train speed) = 72 km / h (in SI system V0 = 20 m / s); S (braking distance) = 800 m.
To determine the braking time of the train in question, we use the formula: S = (V + V0) * t / 2 = (0 + V0) * t / 2, whence t = 2S / V0.
Let’s make a calculation: t = 2 * 800/20 = 80 s.
Answer: The braking time of the train in question was 20 seconds.
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