Three particles A, B and C of equal mass move with equal speed V along the medians of an equilateral triangle as shown in hgure. They collide at the centroid G of the triangle. After the collision, A comes to test, B retraces its path with the speed V. What is the velocity of C ?

Explanation

Initial momentum of a system of particle is zero.
After the collision , the momentum of system of particles should be zero. The momentum of `A` becomes zero after the collision. The final momentum of system should be zero, for this `C` should move opposite to `B` with the same speed `v`.