The floor of a railroad flatcar is loaded with loose crates having a coefficient of static friction of 0.35 with the floor. If the train is initially moving at a speed of 43 km/h, in how short a distance can the train be stopped at constant acceleration without causing the crates to slide over the floor?

1 answer

The maximum force the crate can withstand is mass*g*.35

Its maximum acceleartion is Force/mass or g*.35
So that is the max deacceleartion of the train.