Two particles `A` and `B` of masses `2m` and `m` are placed on a smooth surface at separation `d`. They move towards each other due to the mutual attractive force.
(i) The particles will meet at distance `d//3` from the initial position of mass `2m`.
(ii) The speed of `A` will be half of speed of `B` until the particles collide (excluding the initial speed).
(iii) The distance covered by `B` is always double that covered by `A` until the particles collide.
(iv) The velocity of center of mass is always zero.