Physics - Rotation Question with Solution | TestHub

Total angular momentum about $O$ is given as, $$\begin{array}{rl}\mathbf{L}& ={\mathbf{L}}_1+{\mathbf{L}}_2=m_1{V}_1{I}_1+m_2{V}_2{I}_2\\ & =-6.5\times 2.2\times 1.5+3.1\times 3.6\times 2.8\\ & =-21.45+31.248=9.8{\mathrm{kgm}}^2/\mathrm{s}\end{array}$$