Complete the differential level notes shown below, and determine the height of instrument of the second setup. STA BM 10 2.085 TP1 BS (m) HI (m) FS (m) | ELEVATION (m) 137.450 2.015 0.982 1.428 TP2 1.864 BM11 0.423 2.423 a. 140.57 m b. not included in the list С. 138.553 m d. 139.54 m e. 141.00 m

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A: Draw Free body diagram:

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Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.