A man holding a heavy object in each hand stands on a small platform that is free to rotate about a vertical axis. Initially he is standing with his arms outstretched and he and the platform are rotating with an angular velocity of 0.800 rad/s. With his arms outstretched, the moment of inertia of the system (man + platform + weights) is 4.00 kg•m^{2}. Then he pulls the weights in close to his chest, and the moment of inertia of the system becomes 3.00 kg•m^{2}. How much work did the man do when he pulled his arms in?