Question: A 3.0 kg object moving at 8.0m/s in the positive direction of an x axis has a one-dimensional elastic collision with an object of mass

A 3.0 kg object moving at 8.0m/s in the positive direction of an x axis has a one-dimensional elastic collision with an object of mass M, initially at rest. After the collision the object of mass M has a velocity of 6.0 m/s in the positive direction of the axis. What is mass M?

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