A 180-g billiard ball is shot toward an identical ball at velocity vi = 6.90 m/s. The identical ball is initially at rest. After the balls hit, one of them travels with velocity v1, f = (1.80 + 2.22) m/s. What is the velocity of the second ball after the impact? Ignore effects of friction during this process. (Express your answer in vector form.) v2, f = m/s

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