Which one of the following expresses the total elongation of a bar of length L, with constant cross-section of A and modulus of elasticity E, hanging vertically and subjected to its own weight, W?

Which one of the following expresses the total elongation of a bar of

1.	Which one of the following expresses the total elongation of a bar of length L, with constant cross-section of A and modulus of elasticity E, hanging vertically and subjected to its own weight, W?
A.	\(\frac{{WL}}{{AE}}\)
B.	\(\frac{{WL}}{{2AE}}\)
C.	\(\frac{{2WL}}{{AE}}\)
D.	\(\frac{{WL}}{{4AE}}\)
Answer» C. \(\frac{{2WL}}{{AE}}\)