Write the $SI$ unit of angular momentum and its dimensional formula.

(N/A) Angular momentum $(L)$ is defined as the product of the position vector $(r)$ and linear momentum $(p)$,given by the formula $L = r \times p$.
Since $p = mv$,the dimensions of angular momentum are $[M^1 L^1 T^{-1}] \times [L^1] = [M^1 L^2 T^{-1}]$.
The $SI$ unit of mass is $kg$,velocity is $m/s$,and distance is $m$.
Therefore,the $SI$ unit of angular momentum is $kg \cdot m^2/s$ or $J \cdot s$.