When the truss is subjected to the vertical force F , joint A moves a distance v = 0.1 m vertically and a distance u = 0.3 m horizontally. If the normal strain ε AB in the direction parallel to member...

When the truss is subjected to the vertical force
F, joint
A
moves a distance
v
= 0.1 m vertically and a distance
u
= 0.3 m horizontally. If the normal strain
ε_AB

in the direction parallel to member
AB
is uniform throughout the length of the member, what is
ε_AB
?