Determine Work done on the puck?? 1. The problem statement, all variables and given/known data The puck in the figure has a mass of 0.799 kg. Its original distance from the center of rotation is 76.2 cm, and the puck is moving with a speed of 91.0 cm/s. The string is pulled downward 38.2 cm through the hole in the frictionless table. Determine the work done on the puck. 2. Relevant equations W=fd centripetal force=mv^2/r KE=1/2 mv^2 3. The attempt at a solution Not really sure how to do this problem. I tried using the formula mv^2/r and (0.799)(0.910)^2/(0.762) = 0.868 Joules, but this is not the right answer.