$758-14.$ A solid circular rod that is $600mm$ long and $20mm$ in diameter is subjected to an axial force of $P=50kN.$ The elongation of the rod is $=1\mathrm{.}40mm,$ and its diameter becomes $d^{\text{'}}=19\mathrm{.}9837mm.$ Determine the modulus of elasticity and the modulus of rigidity of the material. Assume that the material does not yield.

Prob. F$8-14$