### A Particle Acted on by Force

A particle with mass 2.13 kg has position $\vec{r}$ and velocity
$\vec{v}$ (see picture.) It is acted on by the force $\vec{F}$.
All three vectors lie in a common plane. Given: $r=2.91m,v=4.18\frac{m}{s}$
and $F=1.88N$. compute (a) angular momentum of the particle and (b)
torque about the origin, acting on the particle. What are the directions
of these two vectors?