A second disc placed gently on a rotating disc: the new angular velocity

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

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

Tap an option to check your answer.