Three boxes of mass m are attached to each other with strings as shown and hung from the ceiling. Answers in this problem should be in terms of m and/or g. You must show all work; answers written down without work will receive no credit. (a): 4 points Find 73, the tension in the lower string. m T 2 m T3 m (b): 4 points Find 72, the tension in the middle string. (c): 4 points Find 71, the tension in the upper string