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Three particles of equal masses are init...

Three particles of equal masses are initial at the vertices of equilateral triangle of side `2sqrt(3)m` in horizontal plane. They start moving towards centroid `O` with equal speed `2m//sec`. After collision at `O`, A stops and `C` retraces its path with same speed. Distance between `B` and `C` just after one second of the collision is `alpham`. Here `alpha` is an integer. Find `alpha`.

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The correct Answer is:
4
Before collision, linear momentum of the system is zero. Therefore, after collision momentum of `B` will be equal and opposite to momentum of `C` (since `P_(A)=0`)
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