Before After collision A railroad car of mass 2.00E+4 kg moving with a speed of 3.40 m/s collides and couples with two other coupled railroad cars each of the same mass that are already moving in the same direction at a speed of 1.40 m/s. What is the speed (in m/s) of the three coupled cars after the collision? Submit Answer Tries 0/16 How much kinetic energy (in ]) is lost in the collision? Submit Answer | Tries 0/16