A steel rod 3 cm in diameter and 5 m long is held between two grips at 95 °C. Find the stress (N/mm^{2}) and the pull (kN) in the rod when the temperature falls to 30 °C, if (i) the ends do not yield and (ii) the ends yield by 0.12 cm. Take E = 2 × 10^{5} N/mm^{2} and α = 12 × 10^{−6} /°C.