A) \[{{(gR)}^{1/2}}\]
B) \[{{(2gR)}^{1/2}}\]
C) \[{{(3gR)}^{1/2}}\]
D) \[{{(gR/2)}^{2}}\]
Correct Answer: B
Solution :
Escape veloci\[{{v}_{e}}=\sqrt{2gR}\]
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