$A$ weightless string can support a tension up to $30 \,N$. $A$ stone of mass $0.5 \,kg$ is tied to its one end and is revolved in a circular path of radius $2 \,m$ in a vertical plane. Then the maximum angular velocity of the stone will be (acceleration due to gravity $g=10 \,m/s^2$)
- A$10 \,rad/s$
- B$\sqrt{60} \,rad/s$
- C$\sqrt{30} \,rad/s$
- D$5 \,rad/s$
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