A 12.0 kilogram shell is launched at an angle of 55o above the horizon with an initial velocity of 150 m/s. When at its highest point, the shell explodes into 2 fragments - 1 fragment is 3 times heavier than the other. The 2 fragments reach the ground at the same time, neglect air resistance. If the heavier fragment lands back at the same point from which the shell was launched, where will the 2nd fragment land and compute how much energy was released by the explosion?