if(th.phase == TouchPhase.Began && (th.phase != TouchPhase.Moved))
                {
                    StartTouchPos = th.position;
                }
if (th.phase == TouchPhase.Moved)
                {
                    currentpositiony = (((CurrentTouchPos.y - StartTouchPos.y) / Screen.height)) + savey;
                }
if(th.phase == TouchPhase.Ended)
                {
                    savey = currentpositiony;
                }

distance = th.deltaPosition.magnitude;

 speed = distance / Time.deltaTime;