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Secondly, for calculations, for the vertical component, I need to divide the drag force calculation into 1.when the ball goes up and 2. when the ball goes down. Because in #1, gravity has negative value, and in #2, gravity has positive value. Right? Yet, why many sites i have seen including the posted PDF files on the internet about projectile motion calculation with air resistance just simply generalize the vertical component calculation into 1 equation?

Lastly, about the equation

a(acceleration vertical component)= -1/m (Fdrag sinX + mg)

when the ball travels downward, isn't angle X negative, hence giving the value sinX negative, and consequently positive drag force?

And do you have any suggestions for good 'projectile with air resistance' sites?

Thank you very much.