1. The problem statement, all variables and given/known data A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from the roof a time of 1.14 s later. You may ignore air resistance. A.) If the height of the building is 20.6 m, what must the initial speed be of the first ball if both are to hit the ground at the same time? 2. Relevant equations vf^2 = v0^2 + 2ax vf = v0 + at x = x0 + v0t + 1/2at^2 3. The attempt at a solution I'm really not sure where to start. If someone could help me out I would greatly appreciate it.