Tie one end of a 1 m string to a doorknob. Put the pulley over this string, so the sheave of the pulley is on top of the string, and the other end of the string goes straight back up. Hang the block directly from the pulley Attach a spring scale to the free end of the string. Slowly pull the free end of the string up 30 cm, measuring the tension force. This raises the block some. The weight of the block is 9.65 Newtons and the tension force is 117 Newtons.How much work was done by this tension force? How much work was done by gravity on the pulley/block system? 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.