Solve Prob. 6.64 when P = 6 kN. Problem 6.64: The diagonal members in the center panel of the truss shown are very slender and can act only in tension; such members are known as counters. Determine the force in members BD and CE and in the counter which is acting when P = 12 kN.

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-2.4 m--2.7 m--2.4 m- DI 1.68 m E. s kN