Question: A shell is fired with an initial velocity of 20 m/s at an angle of 60° above the horizontal. At the top of its trajectory, the shell explodes into two fragments of equal mass. One fragment, whose speed immediately after the explosion is zero, falls vertically. How far from the gun does the other fragment land? Assume that the terrain is level and air resistance is negligible. Should I do this with conservation of momentum for each dimmension? I don't know how I would get a distance from this... So basically I am having a hard time getting the problem set up, I appreciate if anyone can help me with this.