For the vectors $u=($:$-6,0,4$:$)$ and $v=($:$1,2,-2$:$),$ calculate proj $j_{v}u$ and scal ${?}_{v}u.$

$pro{j}_{v}u=$

$$

$$

scal ${?}_{v}u=$

$($Type an exact answer, using radicals as needed.$)$