(a) Three carts of masses 4.00 kg, 10.0 kg, and 3.00 kg move on a frictionless horizontal track with speeds of 5.00 m/s, 3.00 m/s, and 4.00 m/s, as shown in Figure P9.27. Velcro couplers make the carts stick together after colliding. Find the final velocity of the train of three carts.
(b) What If? Does your answer require that all the carts collide and stick together at the same time? What if they collide in a different order?

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-4.00 m/s 5.00 m/s 3.00 m/s 00k 4.00 kg 10.0 kg Figure P9.27