kicking rock of a building.... 1. The problem statement, all variables and given/known data A boy kicks a rock at a velocity of 19.8 m/s horizontally off the top of a 64 meter high building. How far from the top does the rock hit the flat ground? (neglecting air resistance) 2. Relevant equations sorry, i don't know how to type some symbols v^2 = v(initial)^2 + 2a(change in x) a(of y)= -9.8 v^2(for y) = v(initial of y)^2 + 2a(change in y) 3. The attempt at a solution not even sure how to begin. Is 19.8 m/s the initial velocity? how do I relate the equations? Do I need to use sine or cosine of the angle? The answer is 71.6 meters, for the record.