A rubber cord is tied to the ceiling, the free end of which is at a height h above the floor. If you hang a small heavy weight to it, which is then gently lowered, then the end of the cord with the load will drop by a distance of h/3. What is the lowest height above the floor that the weight should then be lifted so that after it is lowered, it hits the floor? How will the response change when replacing the rubber cord with a spring?