Understanding Acceleration

Acceleration is the rate at which an object's velocity changes. It's calculated as:

* Acceleration (a) = (Final Velocity (vf) - Initial Velocity (vi)) / Time (t)

Applying the Information

* Initial Velocity (vi): 25 m/s

* Final Velocity (vf): 10 m/s

* Time (t): 240 s

Calculation

1. Change in Velocity: 10 m/s - 25 m/s = -15 m/s (The negative sign indicates the train is slowing down)

2. Acceleration: (-15 m/s) / 240 s = -0.0625 m/s²

Answer

The train's acceleration is -0.0625 m/s². This means it's decelerating (slowing down) at a rate of 0.0625 meters per second squared.