A horizontal spring, resting on a frictionless tabletop, is stretched 14 centimeter from its unscratched configuration and a 1 kilogram mass is attached to it. The system is released from rest. A fraction of a second later, the spring finds itself compressed 2.7 centimeter from its unscratched configuration.
Obtain how does its final potential energy compare to its initial potential energy? (Give your answer as a ratio, final to initial.)