A) \[\sqrt{gR}\]
B) \[\sqrt{2gR}\]
C) \[\sqrt{3gR}\]
D) \[\sqrt{5gR}\]
Correct Answer: A
Solution :
[a] The velocity should be such that the centripetal acceleration is equal to the acceleration due to gravity \[\frac{{{v}^{2}}}{R}=\operatorname{g}\] Or \[\operatorname{v}=\sqrt{g\,R}.\]
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