A cannon having mass 6.59E3 kg is strictly bolted to the earth therefore it can recoil just by a negligible amount. The cannon fires a shell of 78.5 kg horizontally having an initial velocity of 529 m/s. Assume that the cannon is then unbolted from the earth, and no external force hinders its recoil. Determine what would be the velocity of a shell fired by these loose cannon?