Let there are three equal masses situated at the vertices of an equilateral triangle, as shown in figure. Now the particle A starts with a velocity v1 towards line AB, particle B starts with the velocity v2 towards line BC and particle 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 the displacement of centre of mass if v1=v2=v3?