Two balls with masses 3 kg and 2 kg move toward each other, collide head-on, and stick together after the collision (a perfectly inelastic collision). Before the collision the 3-kg ball moves with a speed of 5 m/s and the 2-kg ball moves with a speed of 10 m/s. Neglect friction. See the figure above. What is the velocity of the balls after the collision? a. -2 m/s b. -1 m/s c. 3 m/s d. 5 m/s

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