camera smooth stop (continuously sliding), on touch end

Hello everybody, I'm trying to make camera like in Bad Piggies, when you previewing whole scene, you can drag your camera with one tap, and on TouchPhase.Ended it sliding continuously till it stops.

In my case X and Y, are calculated like: X = touch_v3_begin.x - touch.position.x.

I'm also thinking that on my TouchPhase.Moved is working not too smoothly..

 switch ( touch.phase )
     {
     case TouchPhase.Began:
         if (!beginshooting)
         {
             isSwipe = true;
             bulletCamFollow = false;
             touch_v3_begin = Camera.main.ScreenToWorldPoint(touch.position);
         }
     break;
       case TouchPhase.Moved:
        if (isSwipe)
        {
             isSwiping = true;
             newpos = camera.transform.position-Vector3(X,Y, 0);
             newpos.z = -10;
             camera.transform.position = newpos;
        }
        break;
   
       case TouchPhase.Ended:
         if (isSwipe)
         {
             isSwipe = false;
             isSwiping = false;
             var distance : float = Vector3.Distance(camera.transform.position, newpos);
 
             SlowDown(distance);
         }
     break;
     }
 }