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Reaction at support and internal axial force resultant

Consider two straight bars of uniform cross section made of the same material. Bar 1 has an axial length 1m of and a square cross section 1mm with side length . Bar 2 has an axial length of 3 m and a round cross section with 2mm diameter. When subjected to 1KN 2 axial tension, bar 1 elongates by 5mm . What will be the elongation of bar 2, , if it is compressed axially with a load of 25KN ?

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