In this part, set up the pulley, spring scale and block as in part 2. Slowly pull the free end of the string up 30 cm, measuring the tension force. This raises the block some. The tension force is 117 Newtons. How much work was done by gravity on the pulley/block system? The Work-Kinetic Energy theorem states that the sum of the works done on a mass is equal to the change in kinetic energy of the mass. If the mass was moved very slowly, at a constant speed, there is no change in kinetic energy. Is the sum of the work done by gravity and by the tension force in the string zero to within uncertainty? Explain any discrepancies if you can