A) \[0.4m/s\]
B) \[0.2m/s\]
C) \[0.1m/s\]
D) \[0.05m/s\]
Correct Answer: A
Solution :
In head on elastic collision velocity get interchanged (if masses of particle are equal). i.e. the last ball will move with the velocity of first ball i.e 0.4 m/s
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