The truss is supported by a pin at A and a roller at E.
Let $R_{Ax}$ and $R_{Ay}$ be the horizontal and vertical reactions at A, and $R_{Ey}$ be the vertical reaction at E.
The external forces are:
- 2 kN at A (downwards)
- $F_1 = 4.5$ kN at B (downwards)
- $F_1
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