0
A) \[3\,\,m{{s}^{-1}}\]
B) \[2\,\,m{{s}^{-1}}\]
C) \[15\,\,m{{s}^{-1}}\]
D) \[5\,\,m{{s}^{-1}}\]
E) None of these
Correct Answer: D
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