At one instant, force F $=8\mathrm{.}66]$ N acts on a $0\mathrm{.}909$ kg object that has position vector $7=(1\mathrm{.}68-1\mathrm{.}68$k$)$ m and velocity vector

$0=(-4\mathrm{.}75+4\mathrm{.}75$k$)$ m$/$s $.$ About the origin and in unit$-$vector notation, what are $($a$)$ the object's angular momentum and $($b$)$ the

torque acting on the object?