Three identical balls are connected by l...

Three identical balls are connected by light inextensible strings with each other as shown and rest over a smooth horizontal table. Length of each string is `l`.
At moment `t = 0`, ball `B` is imparted a velocity `v_(0)` perpendicular to the strings and then the system is left on its own.

Calculate the velocity of `B` just before `A` collides with ball `C`.

`9 m//s`

zero

`3 m//s`

`6 m//sec`

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