A) \[10\,m{{s}^{-1}}\]
B) \[5\,m{{s}^{-1}}\]
C) \[2.5\,m{{s}^{-1}}\]
D) \[1.0\,m{{s}^{-1}}\]
Correct Answer: B
Solution :
In elastic head on collision velocities gets interchanged.
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