Answer to Question #307054 in Physics for rydhe

Question

If a train going 60 m/s hits the brakes, and it takes the train 85 seconds to stop, what is the train’s acceleration? 

Answer 1

The acceleration of the train

$$a=\frac{\Delta v}{\Delta t}=\frac{0-60}{85}=-0.71\:\rm m/s^2$$