$A$ particle inside the rough surface of $a$ rotating cone about its axis is at rest relative to it at $a$ height of $1m$ above its vertex. Friction coefficient is $\mu = 0.5$, if half angle of cone is $45^o$, the maximum angular velocity of revolution of cone can be :
A$\sqrt {10} \,$ rad/s
B$\sqrt {30} \,$ rad/s
C$\frac{{\sqrt {40} }}{3}\,$ rad/s
D$\sqrt {50} \,$ rad/s
Diffcult
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B$\sqrt {30} \,$ rad/s
b
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