A) \[3{{u}^{2}}/g\]
B) \[4{{u}^{2}}/g\]
C) \[6{{u}^{2}}/g\]
D) \[9{{u}^{2}}/g\]
Correct Answer: B
Solution :
\[{{v}^{2}}={{u}^{2}}+2gh\] \[\Rightarrow {{(3u)}^{2}}={{(-u)}^{2}}+2gh\Rightarrow h=\frac{4{{u}^{2}}}{g}\]
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