Throughout a region, equipotential surfaces are given by $z=$ constant. The surfaces are equally spaced with $V=200V$ for $z=0\mathrm{.}00m,V=275V$ for $z=0\mathrm{.}60m,V=3$: the electric field in this region $($in V$/$m$)?($Express your answer in vector form.$)$

vec$(E)=\frac{V}{m}$