Answer:
As Per Provided Information
- Initial velocity of train u is 60m/s
- Final velocity of train v is 0m/s
- Time taken to stop the train t is 1.25min
Let's convert the unit of time
t = 1.25 × 60 s
t = 75 s
We have been asked to determine the acceleration of the train .
Using Formulae

Substituting the value we obtain

Here, negative sign show deceleration .
Therefore,
- Acceleration of the train is -0.8m/s²