Determine the energy released in the explosion DK= ? J

A 236-kg projectile, fired with a speed of 128m/s at a 63.0 angle, breaks into three pieces of equal mass at the highest point of its arc (where its velocity is horizontal). Two of the fragments move with the same speed right after the explosion as the entire projectile had just before the explosion; one of these moves vertically downward and the other horizontally. Determine the energy released in the explosion