1. The problem statement, all variables and given/known data A projectile is launched from the ground with an initial velocity of 140m/s at an angle of θ above the horizontal. (assume AR is negligible and the ground is level) The time of flight is 18.7seconds and its range is 1.98*10^3 show that the launch angle θ is approximately 41 degrees 2. Relevant equations I'm unsure which equation Im supposed to use for a problem like this 3. The attempt at a solution voh = 140cosθ ∴ cosθ = voh/140 but Im not given enough information to find the initial horizontal velocity so this equation won't work. I also am sure that I have to use the time of flight and the range since its been given but I can't think how to rearrange things to make it work. Can anyone point me in the right direction for what I'm supposed to be doing please?