Question How to make a trajectory prediction path take gravity and max speed into account?

Hello! I am trying to make a game where the mouse is dragged across the screen to launch an object (For Example: Angry Birds), and I have a Trajectory system I wish to add two details into but I'm struggling to find a way to do so.

I have a max speed cap which, by itself, does limit the speed of the object, but I wish for the trajectory line to slow and stop the more it progresses towards the max speed to make it more accurate.

I also have a mechanic which switches the balls gravity upon passing a trigger and I want the trajectory line to curve with the gravity to show where the ball will end up after switching gravity.

This is part of my GameManager script:

Code (CSharp):

1. void OnDragStart()
2.     {
3.         ball.DeactivateRb();
4.         startPoint = cam.ScreenToWorldPoint(Input.mousePosition);
5.         trajectory.Show();
6.     }
7.  
8.     void OnDrag()
9.     {
10.         endPoint = cam.ScreenToWorldPoint(Input.mousePosition);
11.         distance = Vector2.Distance(startPoint, endPoint);
12.         direction = (startPoint - endPoint).normalized;
13.         force = direction * distance * pushForce;
14.         Debug.DrawLine(startPoint, endPoint);
15.         trajectory.UpdateDots(ball.pos, force);
16.     }
17.  
18.     void OnDragEnd()
19.     {
20.         ball.ActivateRb();
21.         ball.Push(force);
22.         trajectory.Hide();
23.         if (power >= 1)
24.         {
25.             power--;
26.         }
27.     }

This is part of my Trajectory script:

Code (CSharp):

1.     void PrepareDots()
2.     {
3.         dotsList = new Transform[dotsNumber];
4.         dotPrefab.transform.localScale = Vector3.one * dotMaxScale;
5.         float scale = dotMaxScale;
6.         float scaleFactor = scale / dotsNumber;
7.         for (int i=0; i<dotsNumber; i++)
8.         {
9.             dotsList[i] = Instantiate(dotPrefab, null).transform;
10.             dotsList[i].parent = dotsParent.transform;
11.             dotsList[i].localScale = Vector3.one * scale;
12.             if (scale > dotMinScale)
13.             {
14.                 scale -= scaleFactor;
15.             }
16.         }
17.     }
18.  
19.     public void UpdateDots(Vector3 ballPos, Vector2 forceApplied)
20.     {
21.         timeStamp = dotSpacing;
22.         for(int i = 0; i<dotsNumber; i++)
23.         {
24.             pos.x = (ballPos.x + forceApplied.x * timeStamp);
25.             pos.y = (ballPos.y + forceApplied.y * timeStamp) - (Physics2D.gravity.magnitude * timeStamp * timeStamp) / 2f;
26.             dotsList[i].position = pos;
27.             timeStamp += dotSpacing;
28.         }
29.     }

And this is part of the script for the actual object itself:

Code (CSharp):

1.    public void Push(Vector2 force)
2.     {
3.         rb.AddForce(force, ForceMode2D.Impulse);
4.     }
5.  
6.     public void ActivateRb()
7.     {
8.         rb.isKinematic = false;
9.         rb.velocity = Vector3.zero;
10.         rb.gravityScale = gm.grav;
11.     }
12.  
13.     public void DeactivateRb()
14.     {
15.         rb.velocity = Vector3.zero;
16.         rb.angularVelocity = 0f;
17.         rb.isKinematic = true;
18.     }

I hope that i've been clear and understandable enough, if there's anything else I need to add please let me know, if anyone can help me out with this that would be very much appreciated

It's worthy to note that I have not written all of this code by myself, and have only made edits to it to add my own features.

Original Source: (3467) Unity 2D trajectory predict tutorial , angry birds [Part 2] - YouTube