Alright, I am asking for help on how to start this problem. I did all the other homework problems, but this ones is confusing me. Maybe I am just stupid or something. Anyways, any help would be appreciated, I don't know where to start and have tried a lot of things (spent about an hour just on this problem). A shell is shot with an initial velocity Vo of 20 m/s, at an angle of 60 degrees with the horizontal. At the top of the 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, assuming that the terrainis level and air drag is negligible? It deals with Newton's Second Law for a System of Particles and the answer is 53m. Please help. Thank you for your time.