Objects 1 and 2 collide and stick together. Which best describes the momentum of the resulting single object?

When two objects collide and stick together, their combined momentum equals the total momentum before the collision, provided no external force affects the system. Total momentum is the vector sum of the objects’ initial momenta, so the resulting object’s momentum is object 1’s momentum plus object 2’s momentum. The correct choice is “It is equal to the momentum of object 1 plus the momentum of object 2.”

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