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A round disc of moment of inertia \( I_{2} \) about its axis perpendicular to its plane and
\( \mathrm{P} \) passing through its centre is placed over

W another disc of moment of inertia \( I_{1} \) rotating with an angular velocity w about the same axis. The final angular velocity of the combination of discs is:-
(1) \( \omega \)
(2) \( \frac{I_{1} \omega}{I_{1}+I_{2}} \)
(3) \( \frac{\left(I_{1}+I_{2}\right) \omega}{I_{1}} \)
(4) \( \frac{I_{2} \omega}{I_{1}+I_{2}} \)
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