In a stress relaxation test, a 10 cm long bar of polymer was stretched almost instantaneously until the stress reached 200 MPa. After 2 minutes, the stress measured in the bar decreased to 160 MPa. Assume the material response follows the Maxwell Model. i) Calculate the relaxation time of the material. ii) If the initial stress were reached by extending the bar by 16 mm, what would be the viscosity of the dashpot in the model? iii) Calculate the relaxation modulus of the material after 3 minutes, given the same conditions as in part (ii).