A) \[\frac{2}{3}{{\left( gR \right)}^{1/2}}\]
B) \[{{\left( gR \right)}^{1/2}}\]
C) \[{{\left( 2gR \right)}^{1/2}}\]
D) \[2{{\left( \frac{gR}{3} \right)}^{1/2}}\]
Correct Answer: D
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