A) \[30\text{ }m{{s}^{-1}}\]
B) \[\text{42 }m{{s}^{-1}}\]
C) \[32\text{ }m{{s}^{-1}}\]
D) \[\text{35 }m{{s}^{-1}}\]
E) \[\text{40 }m{{s}^{-1}}\]
Correct Answer: A
Solution :
\[R=\frac{{{u}^{2}}}{g}\Rightarrow u=\sqrt{Rg}=30\,m{{s}^{-1}}\]
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