For the given failure surface, determine whether the slope detailed in Figure below is stable in terms of total stress. The unit weight for both soils is $19$ kN$/$m$3.$ The undrained strength $($cu$)$ is $20$ kPa for soil $1$ and $45$ kPa for soil $2.$ How would the answer change if allowance is made for the development of a tension crack? For the given failure surface, determine whether the slope detailed in Figure below is stable in terms of total stress. The unit weight for both soils is $19$ kN $/$ m$^3.$ The undrained strength $($c$\_$u$)$ is $20$ kPa for soil $1$ and $45$ kPa for soil $2.$ How would the answer change if allowance is made for the development of a tension crack? $(30$