6. Three carts of masses mi = 4.00 kg, m2 = 10.0 kg, and m3 = 3.00 kg move on a frictionless, horizontal track with speeds of v1 = 5.00 m/s to the right, V2 = 3.00 m/s to the right, and v3 = 4.00 m/s to the left as shown in the figure. Velcro couplers (or perhaps clay) make the carts stick together after colliding. a) Find the final velocity of the train of three carts b) Does your answer change if the carts don't couple at the same time? What if they collide in a different order