Angular Momentum (Problem 37)

A particle of mass 5.0 kg has position vector $\vec{r}=(2.0\hat{i}-3.0\hat{j})\text{m}$ at a particular instant of time when its velocity is $\vec{v}=(3.0\hat{i})\text{m}\text{/}\text{s}$ with respect to the origin. (a) What is the angular momentum of the particle? (b) If a force $\vec{F}=5.0\hat{j}\text{N}$ acts on the particle at this instant, what is the torque about the origin? Select the answer to part (a).