The change in the momentum of a system is called impulse.
When we say that momentum is "conserved," we mean
A) The momentum of an object is the same before and after a collision.
B) The momentum of the universe increases; it never decreases.
C) The momentum of an isolated system is constant.
D) If there are no forces acting on an object, its momentum is zero.
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What scientific concept do you need to know in order to solve this problem?
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