Momentum of the first car
"p_1=m_1v_1=1550\\times 37.8=58590\\:\\rm kg\\cdot m\/s\\: (north)"Momentum of the second car
"p_2=m_2v_2=2681\\times 24.5=65685\\:\\rm kg\\cdot m\/s\\; (south)"The total momentum
"p=p_2-p_1=65685-58590=7095\\:\\rm kg\\cdot m\/s\\: (south)"
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