问题描述：
A horizontal spring,resting on a frictionless tabletop,is stretched 17cm from its unstretched configuration and a 1.00-kg mass is attached to it.The system is released from rest.A fraction of a second later,the spring finds itself compressed 3.4cm from its unstretched configuration.
How does its final potential energy compare to its initial potential energy?(Give your answer as a ratio,final to initial.)
Uf/Ui
How does its final potential energy compare to its initial potential energy?(Give your answer as a ratio,final to initial.)
Uf/Ui
问题解答：
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