Mud is stopped using a wall made from 1.2 m high x 0.25 m wide rectangular concrete blocks as shown in figure below. Blocks density is 2700 kg/m3, mud density is 1800 kg/m3, and friction coefficient between ground and concrete blocks is f = 0.3 . There is concern that concrete blocks may slide or tip over the lower left edge as the mud level rises. Determine the mud height at which
A) The blocks will overcome friction, and
B) The blocks will tip over.