$[30$ pts$]$ Consider a simple truss shown below.

Lo pts$]$ The internal force along the member $BC($positive if tension; negative if compression$)=$

pts$]$ The internal force along the member GC $($positive if tension; negative if compression$)=$

pts$]$ The incinal force

$N$ the mber GF $($positive if tension; negative if compression$)=$

$[6$ pts$]$ Type in all the zero$-$force members $($e$.$g$.,$ AB$,$ BC$,$ CD$,$ etc.$)$ in the answer box $=$

Show the solution steps on the paper for the