Q$2)$ for the retaining wall shown

a$-$ Draw the active earth pressure distribution and find the active earth pressure force and its location from the bottom

b$)$ Draw the passive lateral earth pressure diagram and find the passive force. for the passive side $\frac{O}{?}=22,C=3\frac{KN}{m^2},$ and $=10\frac{KN}{m^3}$

c$)$ If the required factor of safety against sliding is $3$ find the required friction resistance force.