What is the acceleration of the train if, when approaching the station, the initial speed of 90 km / h, it stopped in 50 s?
| May 1, 2021 | education
V0 = 90 km / h = 25 m / s.
V = 0 m / s.
t = 50 s.
a -?
The acceleration a of any body, including a train, is a vector physical quantity that shows how its speed changes over time.
Since the speed of the train at the beginning of deceleration was V0, and at the end of deceleration V and deceleration lasted time t, we express it by the formula: a = (V – V0) / t.
a = (0 m / s – 25 m / s) 50 s = – 0.5 m / s2.
The “-” sign in acceleration indicates that the train decreases its speed while moving, it slows down.
Answer: when braking a train, it has an acceleration a = 0.5 m / s2.
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