A grade beam AB supports three concentrated loads and rests on soil and the top of a large rock. The soil exerts an upward distributed load, and the rock exerts a concentrated load ad RR as shown. Knowing that P = 1 kip and wB = 1/2wA determine the values of wA and RR corresponding to equilibrium.

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1.2 ft 1.5 ft| 15ft- 4.5 ft 4.3 kip 6kips B. -5.4 ft -3.6 ft