physics question please helppp?

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answers:
Andrew Smith say: Momentum is conserved.
I answered a different question of yours with the same principle.
m1 v1 + m2 v2 = (m1+m2) V
Note that one of the directions is positive and the other negative.
I choose that 5.15 is positive and that 3.08 is negative.

Substitute in all the values you know and the rest is easy.
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