Calculate the Direct Stress and the Strain at 2 suitable points on the graph.
The material is H C Copper (99.99% cu)
A= 20 mm2
l=25.25 mm

Typical values of Stress/ Extension
1) F= 1500N and x=0.5mm
20 F= 3000N and x= 1mm.

Also, give a definition of Hooke`s Law and comment on whether the law has been verified by the findings of the test.