A train traveling at a speed of 72 km / h goes to a stop 200 m after how long the train stopped.

univerkov | December 2, 2020 | education

Given:
v0 = 72 km / h = 20 m / s
s = 200 m
v = 0
Find t =?
Decision:
Let’s write the formula for the path that excludes acceleration
s = (v + v0) * t / 2
We express time from it
t = 2s / (v + v0)
t = 2 * 200 m / (20 m / s + 0) = 20 s
Answer: t = 20 s

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