Three carts of masses 4 kg, 10 kg, and 3 kg move on a frictionless, horizontal track with speeds of 5 m/s, 3 m/s, and 20 m/s, respectively. Velcro couplers make the carts stick together for a totally inelastic set of collisions. a. What is the final velocity of the three-cart system? Which way is the three-cart system traveling? b. How much thermal energy is generated in this process

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