Two discs are mounted on frictionless bearings on a common shaft. The first disc has rotational inertia / and is spinning with angular velocity `omega`. The second disc has rotational inertia 2/ and is spinning in opposite direction with angular velocity `3omega`, as shown in figure. The two discs are slowly forced towards each other along the shaft until they couple and have a final common angular velocity of

Options

A. 0.6 m
B. 1.2 m
C. 6 cm
D. 12 cm