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By conservation of momentum, we have

CodeCogsEqn (10)

By substituting m, u and v, we have

CodeCogsEqn (11)
CodeCogsEqn (13)

(1): by substituting, we have v = 2u, since u > v, so it is incorrect.

(2): by substituting, we have u-v=u-v, so it is correct

(3): by substituting, we have u =2v, since u > v, so it can be true

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