Simple 2D smooth ball movement

I am working on a very simple, but tricky thing:

I want to move a ball across the screen in a smooth way (in 2D space).

Unfortunately whatever approach I make, I always experience jitter. I am currently evaluating it with the editor Gameview running constantly at 60fps.

Aproach #1)
Apply a Rigidbody to the ball Mass 0.01
Drag 0
Angular Drag 0
Gravity off
Interpolate Interpolate
Collision Detection Continous
Contraints:
Freeze Position Z
Freeze Rotation X,Y,Z

Starting Movement with:
rigidbody.AddRelativeForce(new Vector3(0, 30, 0));

Does not look very bad, but its not a smooth animation

Approach #2)
Without rigidbody
Vector3 velocity = new Vector3 (0,30,0);
void FixedUpdate()
{ Vector3 velocityComponent = velocity * Time.fixedDeltaTime; transform.position = transform.position + velocityComponent; }

still no good results