Ok, I am a bit stuck on a homework problem. I know the following: Initial speed: 25 m/s Distance: 49.85 m Initial height: 30 m And that is it. I know that one possible initial trajectory is 70 degrees, but I need to find the other, and that is where I am having a problem. Of the equations that I know, it leaves me with two variables: theta and time. My original idea was to take t=sx/(25*sin(Θ)), and use that to replace the t's in sy=V0y*t + 1/2 a*t2. The problem then becomes that I cant figure out how to solve for theta when I have cos and sin in the picture. (V0y being replaced by 25*cos(Θ)) Is there an easy way to get this done, or can someone at least give me a push in the right direction? Thank you.