[tex]\bull\sf m_1=17kg[/tex]
[tex]\bull\sf m_2=31kg[/tex]
[tex]\bull\sf v_1=23m/s[/tex]
[tex]\bull\sf v_2=?[/tex]
According to law of conservation of momentum
[tex]\\ \sf\longmapsto \Delta P=P[/tex]
[tex]\\ \sf\longmapsto m_1v_1=m_2v_2[/tex]
[tex]\\ \sf\longmapsto v_2=\dfrac{m_1v_1}{m_2}[/tex]
[tex]\\ \sf\longmapsto v_2=\dfrac{17(23)}{31}[/tex]
[tex]\\ \sf\longmapsto v_2=\dfrac{391}{31}[/tex]
[tex]\\ \sf\longmapsto v_2=12.6m/s[/tex]
