Question

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the conservation of momentum
□ requires that an object will not change velocity unless acted on by an outside force
□ only applies to solid collisions where the objects bounce off each other
□ means that the momentum of a group of objects cannot change unless external forces act
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Explanation:

The conservation of momentum states that the total momentum of a closed - system (a group of objects with no external forces acting on them) remains constant. An object not changing velocity unless acted on by an outside force is Newton's first law. Conservation of momentum applies to all types of collisions (not just solid ones where objects bounce off each other), including inelastic and elastic collisions in any state of matter (solid, liquid, gas).

Answer:

means that the momentum of a group of objects cannot change unless external forces act