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iOS Build a Game with Sprite Kit Actions and Animations Shooting Projectiles using SKAction: Part 2

Okay , so i went throw the projectile tutorial/ lesson and uh whats happening ? ;p

So what happened there? i didn't understand much really . Is this all maths ? i get some of it but how complicated is that . Could anyone expelling me this again or does anyone have or know any good video to watch this ? or maybe some work exercises about this in maths?