1. The problem statement, all variables and given/known data Classic cannon ball launched with an initial horizontal velocity from an elevated position. Initial hvelocity: v Final velocity (when hits the ground): 4v High of the cliff: 16m Find the initial velocity and the angle at which the ball strikes the ground. 2. Relevant equations R=vt+1/2*a*t2 finalv=v+a*t 3. The attempt at a solution First, I find the vertical/horizontal info initial horizontal velocity:v initial vertical velocity:0 horizontal acc:0 vertical acc:-9.82 horizontal velocity at instant t:v vertical velocity at instant t:gt horizontal displ: v*t vertical displ:16?? I find t=√2s/a using the vertical info, but then I get stuck.. any hint please?