While building a high, tapered concrete wall, builders used the wooden forms shown in Fig. P2.86. If concrete has a specific gravity of about 2.5, find the total force on each of the three side sections ( \(A, B\), and \(C\) ) of the wooden forms (neglect any restraining force of the two ends of the forms).

Figure P2.86

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12 ft 6 ft 8 ft Freshly poured concrete Wooden forms Hardened concrete