A cannon is fired horizontally from a platform (see figure). The platform rests on a flat, icy, frictionless surface. Just after the shell is fired and while it is moving through the barrel of the gun, the shell (mass 3.4 kg) has an acceleration of +2475 m/s2. At the same time, the cannon has an acceleration of -0.68 m/s2. What is the mass of the cannon?
