When approaching the station, the train reduced its speed from 90 km / h to 45 km / h for 25 seconds

When approaching the station, the train reduced its speed from 90 km / h to 45 km / h for 25 seconds. determine the acceleration of the train.

To find the acceleration of a given train dropping speed in front of the station, we apply the formula: a = (V – V0) / t.

Values of variables: V – final speed (V = 45 km / h; in SI system V = 12.5 m / s); V0 is the speed before approaching the station (V0 = 90 km / h; in the SI system V0 = 25 m / s); t – braking time (t = 25 s).

Let’s make a calculation: a = (V – V0) / t = (12.5 – 25) / 25 = -12.5 / 25 = -0.5 m / s2.

Answer: The acceleration of the train was -0.5 m / s2.