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Conservation of Momentum
If an external force is not applied to a system, then momentum is conserved. For example, consider one dimensional motion, and suppose there are two objects $A$ and $B$ with masses $m_A$ and $m_B$, respectively. If the initial velocity of object $A$ is $v_{A_i}$ and the initial velocity of object $B$ is $v_{B_i}$, then $m_A…