Two rotating discs brought into contact: common angular speed or energy lost

1. A.
   $\frac{I_{1}I_{2}}{\left( I_{1} + I_{2} \right)}\left( \omega_{1} - \omega_{2} \right)^{2}$
2. B.
   $\frac{\left( I_{1} - I_{2} \right)^{2}\omega_{1}\omega_{2}}{2\left( I_{1} + I_{2} \right)}$
3. C.
   $\frac{I_{1}I_{2}}{2\left( I_{1} + I_{2} \right)}\left( \omega_{1} - \omega_{2} \right)^{2}$
4. D.
   $\frac{\left( \omega_{1} - \omega_{2} \right)^{2}}{2\left( I_{1} + I_{2} \right)}$

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1. A.
   $\frac{4}{5}\omega$
2. B.
   $\frac{5}{4}\omega$
3. C.
   $\frac{2}{3}\omega$
4. D.
   $\frac{3}{2}\omega$

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