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4. Two balls collide elastically head on. The first ball has a mass of 15 g and an initial velocity of 3.5 m/s to

4. Two balls collide elastically head on. The first ball has a mass of 15 g and an initial velocity of 3.5 m/s to the right, while the second ball has a mass of 22 g and an initial velocity of 4.0 m/s to the left. The final velocity of the 15 g ball is 5.4 m/s to the left. What is the final velocity of the 22 g ball? Type Before Collision After Collision Object 1 Object 2 System Changes

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