A) \[2.5m{{s}^{1}}\]
B) \[5m{{s}^{1}}\]
C) \[10m{{s}^{1}}\]
D) \[20m{{s}^{1}}\]
Correct Answer: C
Solution :
[c] \[S=u\times \sqrt{\frac{2h}{g}}\] \[\Rightarrow \] \[10=u\sqrt{2\times \frac{5}{10}}\] \[\Rightarrow \] \[u=10\,m/s\]
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