A) A 10604-kg railroad car, A, traveling at a speed 30.9-m/s of strikes a 9924-kg car, B, going 13.3-m/s in the same direction. If the cars lock together as a result of the collision, what is their common speed just afterward? See Fig. 7–5. B) A 11076-kg railroad car, A, traveling at a speed 29.0-m/s of strikes a 11700-kg car, B, going 32.2-m/s in the opposite direction. If the cars lock together as a result of the collision, what is their common speed just afterward? See Fig. 7–5.