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6) Mass 1 of 6 kg is initially moving at 9 m/s in the +x direction...

6) Mass 1 of 6 kg is initially moving at 9 m/s in the +x direction and it collides perfectly elastically with mass 2 of 3 kg initially at rest. What is the final velocity of mass 2 after the collision in m/s? (Note: the masses are not needed to answer this question.)

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