申論題

4. (25%) A cannon in a fort at height h from the sea level overlooking the ocean fires a shell of mass m at an angle of θand muzzle velocity vo. See the figure below. At the highest point the shell explodes, with additional energy Ea, into two fragments with equal mass, travelling in the original horizontal direction. Neglect the air drag. Find the distance separating the two fragments when they land into the ocean.