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RE: Physics - Classical Mechanics - Projectile motion as a plane motion
The movement I describe here supposes that the whole mass is stored in the center of mass that is mainly the center of the object.
In air, the motion of an 3d object like a sphere (that a ball is) would follow the same exact physics I described here.
The motion on land changes a little bit, because some of the kinetic energy is applied for the rotation .
So, after the ball hits the ground the motion would follow other rules, the rules of 3d physics like torque and so on.
If you are interested check out the following
https://en.wikipedia.org/wiki/Rotating_spheres
https://en.wikipedia.org/wiki/Rotation_around_a_fixed_axis
on wikipedia.
So, the trajectory changes because of the rotation on the ground.
It's actually not that much tho, because a golf ball is pretty small.
I think that we could ignore the rotation, but either way there also is air resistance in real life.
The whole idea of the physics I'm describing supposes that there is no air resistance.
Adding the air resistance to the analysis, we wouldn't have a constant velocity in the x-axis and also wouldn't have a constant acceleration when free falling in the y-axis (that also is not constant because the earth's gravity changes depending on the distance of the object).
I hope that I answered your question :)