(SOLVED) How do I make a throwing (using drag) system for items in my 2D game?

I've looked near and far but I can't find a definitive answer to how I can do this. I'm using image GameObjects with dynamic Rigidbodies and 2D colliders. The dragging function works well but I can't get the items to fly off into the distance whenever you swipe the item. Here is my drag-and-drop code:

  [SerializeField] private Canvas canvas;
  private RectTransform rectTransform;
  private Rigidbody2D rigidbody;


  private void Awake() {
    rectTransform = GetComponent<RectTransform>();
    rigidbody = GetComponent<Rigidbody2D>();
  }

  public void OnBeginDrag(PointerEventData eventData) {
    rigidbody.gravityScale = 0;
  }

  public void OnDrag(PointerEventData eventData) {
    rectTransform.anchoredPosition += eventData.delta / canvas.scaleFactor;

  }

  public void OnEndDrag(PointerEventData eventData) {
    rigidbody.gravityScale = 50;
  }

(sorry for the indent)

I tried this over and over with springs and stuff, and I thought it would throw the item across the screen when you swiped, but it either gives me irrelevant errors or makes no change. Please help!

SOLVED! Here's my full script. I'll comment anything that I've changed.

[SerializeField] private Canvas canvas;
private RectTransform rectTransform;
private Rigidbody2D rigidbody2d;
private SpringJoint2D _spring; // Just a reference to a spring

private void Awake() {
  rectTransform = GetComponent<RectTransform>();
  rigidbody2d = GetComponent<Rigidbody2D>();

  _spring = GetComponent<SpringJoint2D>(); // Set the spring to the spring 
  //I put on my GameObject
  _spring.connectedAnchor = rectTransform.position; // Set the spring's 
  //connected anchor to my object's position
}

public void OnBeginDrag(PointerEventData eventData) {
   rigidbody2d.gravityScale = 0;

   _spring.enabled = true; // Enable the spring (to track movement)
}

public void OnDrag(PointerEventData eventData) {

   if(_spring.enabled == true) { // If the spring is on...
     Vector2 mousePos = Input.mousePosition; // ... Get the mouse position 
     in world coordinates ... 
     _spring.connectedAnchor = mousePos; // .... and set the spring's 
     connected anchor to the mousePos variable.
   }

 }

 public void OnEndDrag(PointerEventData eventData) {
   rigidbody2d.gravityScale = 50;
   _spring.enabled = false; // Disable the spring.
 }

Here are my spring settings:
Enable collision is false.
No connected Rigidbodies.
Don't auto-config connected anchor.
anchor is 0, 0.
(Don't worry about the connected anchor. It doesn't matter.)
Auto-config distance is false.
distance is 0.005 (minimum).
Damping is 0.
Frequency is 2.
BF is infinity.

And that's all!