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For the truss shown in the figure, the forces $F_1$ and $F_2$ are $9$ $kN$ and $3$ $kN$, respectively. The force (in $kN$) in the member QS is

  1. $11.25$ tension
  2. $11.25$ compression
  3. $13.5$ tension
  4. $13.5$ compression
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