The braking distance of the train is 150 meters, the braking time is 30 seconds. Find the initial speed and acceleration of the train.

univerkov | December 16, 2020 | education

We deduce the initial velocity (Vo) from this formula:
S = (Vo + V) * t / 2
Here’s what comes out
Vo = (S * t / 2) -V
Substitute and get
Vo = (150 * 30/2) -0
Vo = 225 (m / s)
Now, we find acceleration and that’s it
a = V-Vo / t
a = 0-225 / 30 = -7.5 (m / s ^ 2)
Answer: a = -7.5 (m / s ^ 2)

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