A) \[3\,\,s\]
B) \[5\,s\]
C) \[7\,s\]
D) \[9\,s\]
Correct Answer: B
Solution :
\[\frac{1}{2}g{{(3)}^{2}}=\frac{g}{2}(2n-1)\Rightarrow n=5\ s\]
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