At time $t=0,a7\mathrm{.}03kg$ particle has position vector vec$(r)=(1\mathrm{.}00m)hat(i)-(5\mathrm{.}00m)hat(j)$ relative to the origin. Its velocity is given by vec$(v)=(-1\mathrm{.}85t^2\frac{m}{s})hat(i)$ for $t$ in seconds. About the origin with $t=17\mathrm{.}6s,$ what are $($a$)$ the particle's angular momentum and $($b$)$ the torque acting on the particle, both in unit$-$vector notation?

$($a$)$ Number

Units

$($b$)$ Number

Units