(Answered) A 30-kg object moving in the positive xdirection has a

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A 3.0-kg object moving in the positive xdirection has a one-dimensional elastic collision with a 5.0-kg object initially at rest. After the collision the 5.0-kg object has a velocity of 6.0 m/s in the positive xdirection. What was the initial speed of the 3.0 kg object?

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