Let there are three equal masses situated at the vertices of an equilateral triangle, as shown in Fig. Now particle A starts with a velocity v1 towards line AB, particle B starts with the velocity v2, towards line BC and particle C starts with velocity v3 towards line CA. Find the displacement of the centre of mass of the three particles A,B and C after time t. What would it be if v1 = v2 = v3?


