How to make ridigbody2D continue physics path after drag

Questions & Answers
1

So far I am able to drag my rigidbody2D around the screen using the following code:

void Update() {
	if (pickedUp) {
                        gameObject.rigidbody2D.gravityScale = 0;
                        screenPoint = Camera.main.WorldToScreenPoint (gameObject.transform.position);
                        Vector3 currentPos = Camera.main.ScreenToWorldPoint (currentScreenPoint);
                        transform.position = currentPos;
                }
	}

void OnTouchDrag (Touch touch) {
                currentScreenPoint = new Vector3 (touch.position.x, touch.position.y, screenPoint.z);
                pickedUp = true;
        }

When I release the gameObject, the gravityScale is returned to 2, and drops as its supposed to. But if the user flings the gameObject quickly, I want physics to take over and “lob” the object. Right now, since I am manipulating the transform.position directly, theres no physics taking place. It does not matter how quickly or slowly I move the object, on release it always drops straight down. To my understanding this can be done with rigidbody.MovePosition(). However, since I am using 2D physics, that function does not exist.

2

On release compare the last two locations (so store one back) and use the result as a velocity vector.

Set drag at a sufficient number to make the motion slow and stop at a rate that looks right to you.