A) \[\sqrt{3}\times 11.2km{{s}^{-1}}\]
B) \[11.2\,km{{s}^{-1}}\]
C) \[\sqrt{2}\times 11.2\,km{{s}^{-1}}\]
D) \[6.5\times 11.2\,km{{s}^{-1}}\]
E) \[2\times 11.2\,km{{s}^{-1}}\]
Correct Answer: B
Solution :
\[KE=\frac{1}{2}m{{v}^{2}}-\frac{1}{2}m{{(11.2)}^{2}}\] \[=\frac{1}{2}m{{(2\times 11.2)}^{2}}-\frac{1}{2}m{{(11.2)}^{2}}\] \[\frac{1}{2}m{{v}^{2}}=3\times \frac{1}{2}m\times {{(11.2)}^{2}}\] \[v=\sqrt{3}\times 11.2\]
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