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Required information

For the Pratt bridge truss and loading shown, determine the average normal stress in member CE$,$ knowing that

the cross$-$sectional area of that member is $5i{n}^2.$ Take $P=75$kips,$Q=100kps,r=13ft$ and $s=7ft$

Using the FBD$/$equilibrium equations of the entire truss,

$($a$)$ The vertical reaction at $A$ is $A_y=($kip$)$

$($b$)$ The vertical reaction at H is $H_y=($kip$)$