Force

$=(2\mathrm{.}0$ N$)+(4\mathrm{.}0$ N$)$

acts on a particle with position vector

$=(5\mathrm{.}0$ m$)+(2\mathrm{.}0$ m$).$

$($a$)$ What is the torque on the particle about the origin, in unit$-$vector notation?

$=$

N $$ m

$($b$)$ What is the angle between the directions of and $?$

$$