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If two disc of moment of inertia l(1) an...

If two disc of moment of inertia `l_(1)` and `l_(2)` rotating about collinear axis passing through their centres of mass and perpendicular to their plane with angular speeds `omega_(1)` and `omega_(2)` respectively in opposite directions are made to rotate combinedly along same axis, then the magnitude of angular velocity of the system is

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