A) 5 rad/sec
B) 2 rad/sec
C) 7.5 rad/sec
D) 7 rad/sec
Correct Answer: D
Solution :
If tension of at highest point is zero than angular velocity \[\omega =\sqrt{\frac{g}{r}=}\,\sqrt{\frac{9.8\times 100}{20}}\] \[=7\,rad/\sec \]
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