Two trains heading straight for each other on the same track are 850m apart when their engineers see each other and hit the brakes, giving both trains a constant deceleration (a). The Express is heading west at a speed of 15.0 m/s, while the east bound Flyer is traveling at a speed of 25 m/s. Calculate the minimum deceleration (a) required for a collision to be avoided. V1 speed of first train = 15.0 m/s V2 speed of second train = 25 m/s x=850 m Can someone please help me solve this problem. I have been staring at it for about an hour and cannot even begin to go anywhere.