A) \[7\text{ }m{{s}^{-1}}\]
B) \[8\text{ }m{{s}^{-1}}\]
C) \[9m{{s}^{-1}}\]
D) \[12m{{s}^{-1}}\]
E) \[10\text{ }m{{s}^{-1}}\]
Correct Answer: E
Solution :
\[\frac{1}{2}\rho {{v}^{2}}=({{p}_{1}}-{{p}_{2}})\] \[\frac{1}{2}\times {{10}^{3}}\times {{v}^{2}}=(4.5\times {{10}^{5}}-4\times {{10}^{5}})\] \[{{v}^{2}}=0.5\times {{10}^{2}}\times 2\] \[=100\] \[\Rightarrow \] \[v=10\,m/s\]
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