Consider the force field $F(x,y,z)=zi+xj+yk.$

$($a$)$ Find the work $W_1$ done by $F$ in moving a particle from the point $(3,0,0)$ to the point $(0,\frac{}{2},3)$ along a straight line.

$W_1=$

$($b$)$ Find the work $W_2$ done by $F$ in moving a particle from the point $(3,0,0)$ to the point $(0,\frac{}{2},3)$ along the helix $r(t)=($:$3cos(t),t,3sin(t)$:$).$

$W_2=$