How can I move a GameObject towards its z Rotation In Unity 2D?

Questions & Answers
1

Rigidbody2D rb;
public float speed=2;

void Start()
{
rb= GetComponent();
}

// Update is called once per frame
void Update()
{

   rb.velocity = new Vector2(,  ) ;
    
}

void OnCollisionEnter2D(Collision2D other)
{
  
 Destroy(gameObject);
            
   
}

}
I dont know what to do with that Vector2

2

Velocity on the Z-axis is not represented in Unity 2D because this axis is perpendicular to the game plane. To change the z-position of a 2D object, you must change the transform.position directly. For example:

void Update()
{
    transform.position += Vector3.forward * speed * Time.deltaTime;
}

_
Note: the object, when constantly moving along the Z axis in the 2D world, will sooner or later go beyond the camera’s visibility.