Problem $1(8$points$)$A bar ACB of length L$=3$m and uniform cross section A$=1$m$^2$ is made of two metal.Segment AC L$1=1$m is made of Aluminum EAC$=100$GPa and segment CB L$2=2$m ismade of steel ECB $=200$GPa. ACB is connected to rigid supports at A and B beforebeing loaded by force P$=100$kN at C$.$ What are the stresses at AC and BC$.$