At time t $=0,$ a $8\mathrm{.}05$ kg particle has position vector $7=(2\mathrm{.}00$ m $)-(9\mathrm{.}00$ m $)$ j relative to the origin. Its velocity is given by

v$=(-3\mathrm{.}16$t$2$ m$/$s $)$ for t in seconds. About the origin with t $=10\mathrm{.}7$ s$,$ what are $($a$)$ the particle's angular momentum and $($b$)$ the

torque acting on the particle, both in unit$-$vector notation?