3. (15 points) We can apply a stress of 10 MPa to stretch out a piece of Saran Wrap (about 5% strain) over some delicious leftover food that is still hot. About 10 minutes later, the stress will be only 4 MPa with the film still strained 5%. Calculate an estimate of the stress in the same film after 30 minutes, assuming the relaxation mechanisms occurring in the polymer remain unchanged even though the food may be cooling off over time