$2)$ At one instant, force $4\mathrm{.}0$ j NF $=$

$$ acts on a $0\mathrm{.}25$ kg object that has position vector

$$

$()2\mathrm{.}0$i $2\mathrm{.}0$k mr $=$

$$ and velocity vector $$

$()5\mathrm{.}0$i $5\mathrm{.}0$k m$/$sv $=+$

$.$ About the origin and in unit$-$vector

notation, what are $($a$)$ the object$$s angular momentum and $($b$)$ the torque acting on the object?