A 2-kg ball of putty moving to the right has a head-on

Question

inelastic collision with a 1-kg putty ball moving to the left.
If the combined blob doesn’t move just after the collision,
what can we conclude about the relative speeds of the
balls before they collided?

Answer 1

Conclusion: m1*V1 = m2*V2.
2*V1 = 1*V2
V2 = 2V1

Answer 2

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