A force of 5000N is applied outwardly to each end of a 5:0m long rod with a radius of 34:0 cm and a Youngs modulus of 1:25  108 N=m2. What is the elongation of the rod ?

You can apply \sigma = E \epsilon, where stress = \sigma = F/A_o and strain = \epsilon = \Delta L/L_o.

You have all the data you need to solve for \Delta L