A disc of mass $m$ and radius $r$ is free to rotate about its centre as shown in the figure. A string is wrapped over its rim and a block of mass $m$ is attached to the free end of the string. The system is released from rest. The speed of the block as it descends through a height $h$, is .....
A disc of mass $m$ and radius $r$ is free to rotate about its centre as shown in the figure. A string is wrapped over its rim and a block of mass $m$ is attached to the free end of the string. The system is released from rest. The speed of the block as it descends through a height $h$, is .....
- A
$\sqrt{2 g h}$
- B
$\sqrt{\frac{2}{3} g h}$
- C
$2 \sqrt{\frac{g h}{3}}$
- D
$\frac{1}{2} \sqrt{3 g h}$
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- [JEE MAIN 2019]