9) Two balls with different masses move with different speeds toward each other. In order to solve this question, we can use the conservation of momentum. All we need to do is consider the momentum before and after the collision. Just remember that we need to keep the positive direction constant. Let's say that if the object goes to the right, its velocity is positive.
By using the conservation of energy, we can equate the momentum before and after the collision.
Answer: B
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