$7)$ Assuming $\backslash ($ H$=5\backslash$mathrm$\{$~m$\},$ R$=3\backslash$mathrm$\{$~m$\}\backslash )$ and the gate is $4$ m wide, the force $\backslash ($ P $\backslash )$ needed to just open the gate is nearest to:

$0)000\mathrm{.}0$ kN

c$)594\mathrm{.}2$ kN

d$)737\mathrm{.}8$ kN

e$)649\mathrm{.}5$ kN