initial momentum of 2 kg blob is given as
[tex]P_1 = m_1v_1[/tex]
here we have
[tex]m_1 = 2kg[/tex]
[tex]v_1 = 3m/s[/tex]
[tex]P_1 = 3(2) = 6 kg m/s[/tex]
initial momentum of 3 kg blob is given as
[tex]P_2 = m_2v_2[/tex]
here we have
[tex]m_2 = 3kg[/tex]
[tex]v_2 = 0m/s[/tex]
[tex]P_2 = 3(0) = 0 kg m/s[/tex]
So initially 2 kg Blob has most momentum before they collide