1. The problem statement, all variables and given/known data Train goes at 280km/h. Starts breaking with a constant acceleration of -2m/s-2. How many meters does it perform until it stops completely? Sorry if the English is poor. 2. Relevant equations If I had them I probably wouldn't be asking. 3. The attempt at a solution Well, 280km/h equals to about 77.78 m/s. Great, what now?