@ rotational inertia : I; initially at rest @ rotational inertia = I and. Stewart et al., Coiiege Physics for the AP'\" Physics I Course, 2e, 2019 W. H. Freeman and Company 5. Two identical thin rings are shown. The lower ring, supported by very thin spokes that are not shown, spins freely about its vertical axis with an initial angular speed mg. The other ring, initially stationary, is then lowered on top ofthe first and friction forces cause the two rings to spin together. The kinetic energy of the system of two rings after they are spinning together could be expressed by which of the following? 2 A. Iwo Iw2 B. J 22 Iw c. 42 Iw D. J 8