1. Two blocks with masses M1 and M2 hang one under the other. For this problem, take the positive direction to be upward. and use 9 for the magnitude of the acceleration due to gravity. a. Assume the blocks are at rest. Find T2, the tension in the lower rope. Express your answer in terms of some or all of the variables M1, M2, and g. b. Assume the blocks are still at rest. Find T1, the tension in the upper rope. Express your answer in terms of some or all of the variables M1, M2, and g. c. The blocks are now accelerating upward (due to the tension in the strings) with acceleration of magnitude a. Find T2, the tension in the lower rope. Express your answer in terms of some or all of the variables M1, M2, a, and g. d. Find T1, the tension in the upper rope