A particle of mass 2 kg is moving such that at time t, its position, in meter, is given by r (t)=5 i -2 t^2 j. The angular momentum of the particle…

A particle of mass $\displaystyle 2$ kg is moving such that at time t, its position, in meter, is given by $$\vec{r}(t)=5 \hat{i}-2 t^2 \hat{j} \text {. The angular momentum } $$ of the particle at $\displaystyle \mathrm{t}=2 \mathrm{~s}$ about the origin in $\displaystyle \mathrm{kg} \mathrm{m}^{-2} \mathrm{~s}^{-1}$ is :