1. The problem statement, all variables and given/known data A model for the suspension of a vehicle is shown where the spring has stiffness k = 178 N/mm and an unstreched length of 347 mm. http://imgur.com/1dTVs12 Determine the value P and the force supported by member AB so that the suspension has the equilibrium position shown where member AB is horizontal. 2. Relevant equations ΣF=0 ΣFxi+ΣFyj=0, ΣFx=0, and ΣFy=0. Spring Law: Fs=kδ=k(L-L0) 3. The attempt at a solution I started by trying to find the force of the spring Fs= 178 N/mm (RCA-347mm) Finding RCA I took the pythagorean theorem (141)2+(229)2=RCA, RCA=268 However when I put that number back into the equation it's a negative number... I don't understand why or what I'm doing wrong.