I'm trying to understand why higher speeds and small σ make the approximation more fine. At smaller σ won't their be more drag in the horizontal and thus distort the trajectory more than a higher σ. At σ=90 shouldn't this approximation be the most accurate since the force exerted on the way up...
Last semester I did a project for grade 12 physics where I had to account for air resistance in projectile motion. I just wanted to post my solution here and as I never found out the merit of the solution, my teacher said that it came out to around the right anser but he said he didn't...