The position vector of \( 1 \, \text{kg} \) object is \( \vec{r} = (3\hat{i} - \hat{j}) \, \text{m} \) and its velocity \( \vec{v} = (3\hat{j} + \hat{k}) \, \text{m}\,\text{s}^{-1} \). The magnitude of its angular momentum is \( \sqrt{x} \, \text{N}\,\text{m} \) where \( x \) is _______.
