LineRenderer act like catapult rope

i would like to use linerenderer act like catapult rope.
rope move realistically with the rock holder.
Basically i have two gameobject rope1, and rope2 with linerenderer added.
I just don’t know where to start

This is very simple but just for the start

in the inspector of line renderer make rope1 Positions element 1 touch the rope2 element1
add this script to MainCamera

    private GameObject rope1, rope2;
    private Vector3 fingerPos;
	// Update is called once per frame
	void Update () {
        if (Input.GetMouseButton(0))
            fingerPos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, ));
            rope1.GetComponent<LineRenderer>().SetPosition(1, fingerPos);
            rope2.GetComponent<LineRenderer>().SetPosition(1, fingerPos);


when you click and hold down mouse it will move the rope