Word Count : 239

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In the center of mass (CM) frame of reference, the velocities of the two particles before and after the collision can be determined by first calculating the velocity of the center of mass (V_cm). For two particles of masses ( m_1 ) and ( m_2 ), with initial velocities ( v_1 ) and ( v_2 ) in the laboratory _______ ______ _____ _________ ____ _____ _________ ______ ________ ______.
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