A body of mass \( 5 \, \text{kg} \) moving with a uniform speed \( 3\sqrt{2} \, \text{m/s}^{-1} \) in the \( X - Y \) plane along the line \( y = x + 4 \). The angular momentum of the particle about the origin will be ______ \( \text{kg m}^2 \text{s}^{-1} \).