Three identical balls are connected by light inextensible strings with each other as shown and placed 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 string and then the system is left on its own. The speed of A at the instant just before it collides with C is

 

• A

  $\frac{v_0}{3}$
• Correct answer
  B

  $\frac{2v_0}{3}$
• C

  $\frac{2v_0}{5}$
• D

  $\frac{2v_0}{9}$

Hence, the correct answer is option: 'B'.