Question

Two balls A and B of mass 'm' and '2m' are in motion with velocity '2v' and 3'v' respectively.

Answer 1

Assume it is a collision and conservation of momentum and energy problem.

m1= 2m. m2=3m.

If they are traveling in the same direction then,
v1 = 7v/3. v2=10/3 v.
Both continue in the same direction.

If they are traveling in opposite directions then ,
v1= v/3. v2= -14/3 v.
Both get rebounded back.

See diagrams.