How do I keep bullet speed fixed while keeping its travelling rotation? (2D Topdown)

I'm trying to shoot a bullet towards where I'm looking trough using my mouse cursors position, though the farther out I hold my mouse the faster my bullets travel. How could I make it so all my bullets travel at the same speed? The code im using is:

public class BulletMove : MonoBehaviour { [SerializeField] private GameObject bullet; [SerializeField] private GameObject ship; [SerializeField] private GameObject camera; public Vector3 mousepos = Input.mousePosition; public Vector2 shippos = new Vector2(); public Vector3 relativeship = new Vector3();

 void Start()
 {
     shippos = ship.transform.position;
     mousepos = Input.mousePosition;
     mousepos.x = mousepos.x - Screen.width / 2;
     mousepos.y = mousepos.y - Screen.height / 2;
     relativeship = camera.transform.InverseTransformDirection(mousepos - camera.transform.position);
  
 }



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

     Vector2 newPos2 = bullet.transform.position;
     newPos2.x = newPos2.x + (relativeship.x / 10f) * Time.deltaTime;
     newPos2.y = newPos2.y + (relativeship.y / 10f) * Time.deltaTime;
     bullet.transform.position = newPos2;


 }

}

and my code to spawn(if it helps) the bullet is:

public class Shoot : MonoBehaviour { [SerializeField] private GameObject bullet; [SerializeField] private GameObject ship; [SerializeField] float cooldown = 1;

 void Update()
 {
     cooldown -= (3f * Time.deltaTime);
     if (Input.GetKey(KeyCode.Mouse0) && cooldown < 0f)
     {
         Vector2 newPosition = ship.transform.position;
         GameObject shot = Instantiate(bullet, newPosition, ship.transform.rotation);
         cooldown = 1f;
       
         }

     }

 }