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Two disks are rotating about the same axis. Disk \( A \) has a moment of inertia of \( 3.4 \mathrm{~kg} \cdot \mathrm{m}^{2} \) and an angular velocity of \( +7.2 \mathrm{rad} / \mathrm{s} \). Disk \( B \) is rotating with an angular velocity of \( -9.8 \mathrm{rad} / \mathrm{s} \). The two disks are then linked together without the aid of any external torques, so that they rotate as a single unit with an angular velocity of \( -2.4 \mathrm{rad} / \mathrm{s} \). The axis of rotation for this unit is the same as that for the separate disks. What is the moment of inertia of disk \( B \) ?
(A) \( 4.4 \mathrm{~kg} \cdot \mathrm{m}^{2} \)
(B) \( 2.4 \mathrm{~kg} \cdot \mathrm{m}^{2} \)
(C) \( 5.2 \mathrm{~kg} \cdot \mathrm{m}^{2} \)
(D) \( 3.6 \mathrm{~kg} \cdot \mathrm{m}^{2} \)
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