A wheel, with rоtаtiоnаl inertiа I{"versiоn":"1.1","math":"I"}, mounted on a vertical shaft with negligible rotational inertia, is rotating with angular speed ω0{"version":"1.1","math":"ω0"}. A non rotating wheel with rotational inertia 2I{"version":"1.1","math":"2I"} is suddenly dropped onto the same shaft as shown. What is the resultant rotational speed of the combination of the two wheels and shaft?