A) \[2\text{ }m{{s}^{-1}}\]
B) \[4m{{s}^{-1}}\]
C) \[8\text{ }m{{s}^{-1}}\]
D) \[16m{{s}^{-1}}\]
Correct Answer: C
Solution :
Given: kinetic energy \[=4\times \]momentum \[\frac{1}{2}m{{v}^{2}}=4\times mv\] \[v=4\times 2=8m/s\]
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