A vertical retaining wall has a height of 5.5m. it supports a soft backfill with a unit weight of 15.5 KN/m³ and has  a cohesion of 16.6 KN/m². The undrained angle friction is 0 Determine the  A. Max. Depth of the tensile crack  B. The lateral force before tensile cracks occur C. The lateral force after tensile cracks occur

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