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A 100 g object with velocity vector [1, 3] m/s collides with a 120 g object...

A 100 g object with velocity vector [1, 3] m/s collides with a 120 g object having velocity vector [-3, 2] m/s. After the collision the 100 g object is observed to have velocity vector [2,-1] m/s. What is the velocity vector of the 120 g object after the impact?

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