Right im currently writing an assignment where by i have to expand on something i studyed during my engineering science phase. I have choosen to do projectiles, in particular a trebuchet firing. Now this is fine if i wanted to do an example where the projectile comes under no air resistance, as we were given all the relevant equations in class such as
Range = (u^2 sin 2θ)/g
But i've seen a few basic equations for working out the force but not sure how to relate it back to my original working, ie if the following is true
f = Dv^2
Where force is equal to D times velocity squared, and D is
D = rCA/2
Where C is the drag coeffiecent (would just make it up for my example), A is the projectiles cross sectional area hitting the air and r if the density of the air, taken a random token reading of something near sea level.
So my question basically is can i simply work out what my velocity would be with a given force and then subtract that velocity from the one i worked out in an airless environment??
I understand this probably isn't the best place to ask but any help is appreciatted.