1. The problem statement, all variables and given/known data I need to find the tangent of the angle, but I don't think that is the part I'm messing up... Assume the particle doesn't hit the wall. Initial velocity is v. It seems that Vix = 0m/s and ay=0 m/s 2. Relevant equations I thought vfx^2 =vix^2 +2a(xf-xi) f=ma , f=eq 3. The attempt at a solution ax=a=f/m=eq/m vfx2=vix2+2a(xf-xi) vfx=(vix2 +2a(xf-xi))1/2 vfx=(2a*h/2)1/2 vfx=(eqh/m)1/2 Since vix=0, v=vfy tanθ=(eqh/m)1/2/v I've spent way too long on this.