Make an object that moves relative to the touch more natural

Hello, I am trying to make a game where an object is moved horizontally on the screen, and I want that object to be moved relative to finger touch. This is what I got from somewhere around here in the forum:

 if (Input.touchCount == 1)

     {
         Touch touch = Input.GetTouch(0);
         if (touch.phase == TouchPhase.Moved)
         {
             transform.Translate(touch.deltaPosition.x / Screen.width * velocityConstant, 0.0f, 0.0f);
             transform.position = new Vector2(Mathf.Clamp(transform.position.x, leftLimit, rightLimit), transform.position.y);
         }
     }

Now, it works fine, it does what it's supossed to do, but I noticed that it's so accurate that it feels really stiff. What I would like to do is make it to feel more "natural". Maybe so that it continues sliding for a bit after I stopped moving. I've tried using a rigidbody component and "addforce", but failed by making the object move extremely inconsistently. I would appreciate any help. Thank you :)