Disk Y of rotational inertia about its center is held at rest above disk X of rotational inertia about its center. Disk initially rotates about its center with an angular velocity of . Disk is then slowly lowered onto disk until both disks are in contact and rotate together with a common angular velocity. Which two of the following predictions are correct about the angular momentum of disk and disk immediately before and after the rotational collision? Select two answers.

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