1. The problem statement, all variables and given/known data Three identical balls are connected by light inextensible strings with each other as shown and rest over a smooth horizontal table .At the moment t=0,ball B is imparted a velocity.Calculate the velocity of A when it collides with ball C. 2. Relevant equations 3. The attempt at a solution Since no external force acts on the system,the CM will continue to move at [itex]v_0[/itex]. Initially CM is present at ball B.It will continue to move upwards with the same velocity.Momentum of the system remains conserved at all times. After that I am unable to proceed?