A prismatic bar has a cross section of 25 mm × 50 mm and a length of 2 m. If the bar is subjected to an axial tensile force of 90 kN, the bar is elongated by 1.5 mm. What is the tensile stress?

1
3.6 N/mm2
2
7.2 N/mm2
3
36 N/mm2
4
72 N/mm2

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