Question

Two masses m1 and m2 move towards one another, each at speed V. Immediately after theycollide, m1 is

at rest in this reference frame. The other mass, m2, is moving away (in the opposite direction it was moving before the collision) at speed 2V. What can we say about this collision? I know its an elastic collision but I am stuck on the relationship of m2 equal to m1

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