Conservation of energy problem dealing with a frictionless pulley

A system containing a frictionless pulley is described in the diagram (see question attachment). If this system is released, at what speed does the 12.0 kg object hit the floor? HINT: Does the 12.0 kg object undergo free fall? Why or why not?

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...rag the 6.0kg object to move along with itself, which in effect is shown as a force in the opposite direction as the gravitational force of the 12.0kg ...