A particle of mass $\mathrm{m}=5 \mathrm{kg}$ is moving with a uniform speed  $\mathrm{v}=3\sqrt{2} \mathrm{m}/\mathrm{s}$ in the XOY plane along the line $\mathrm{y}=\mathrm{x}+4$  . The magnitude of the angular momentum of the particle about the origin is