The logic behind bullet behavior

I have created a game in Construct 2 that used the bullet behavior. Now I'm using another engine (Unity) and I'm making a sequel of the game. Since there is no bullet behavior in Unity, I don't know how to make my own version of the bullet of C2 bullet in Unity. Can anyone tell me what is the logic of the bullet behavior in c2 , how it works so I can implement it in my new game?

every tick

--- set x to self.x+speed*cos(angleOfMotion)*dt

--- set y to self.y+speed*sin(angleOfMotion)*dt