A system Consists of two particles A and B$.$ Knowing that $m_A=3kg$ and $m_B=1kg$ and that the position of the particles A and $B$ expressed in meters are, respectively, vec$(r{)}_A=2$hat$()+$hat$()$ and vec$(r{)}_B=3$hat$()+$hat$(k)$ and the velocities of the particles expressed in $\frac{m}{s}$ are, respectively, $v_A=$hat$()+2$hat$()$ and vec$(v{)}_B=-2$hat$()+2$hat$(k)$ determine the angular momentum vec$(H{)}_o$ of the system about $0.$