Friction coefficient between base of wall and soi is $0\mathrm{.}35$

$($a$)$ Plot the lateral stress distributions on the active and the passive sides

$($b$)$ Neglecting negative stresses on the active side $($use the concept of similar triangle to determine the

depth$),$ calculate the forces acting on the wall on the active and passive sides

$($c$)$ Neglecting the force due to negative stresses on the active side, calculate factor of safety against

sliding and overturning

$($d$)$ Comment whether the factors of safety in part $($c$)$ are good or bad