As shown in the figure, a bob of mass $\mathrm{m}$ is tied by a massless string whose other end portion is wound on a fly wheel (disc) of radius $\mathrm{r}$ and mass $m$. When released from rest the bob starts falling vertically. When it has covered a distance of $h$. the angular speed of the wheel will be
As shown in the figure, a bob of mass $\mathrm{m}$ is tied by a massless string whose other end portion is wound on a fly wheel (disc) of radius $\mathrm{r}$ and mass $m$. When released from rest the bob starts falling vertically. When it has covered a distance of $h$. the angular speed of the wheel will be
- [JEE MAIN 2020]
- A
$\frac{1}{r} \sqrt{\frac{2 g h}{3}}$
- B
$ r \sqrt{\frac{3}{4 g h}}$
- C
$ \frac{1}{r} \sqrt{\frac{4 g h}{3}}$
- D
${r} \sqrt{\frac{3}{2 g h}}$
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