题目

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

提问时间：2020-07-25

答案

我物理不是特别好 但是翻译一下应该还是可以的 有些词你自己再把握下 我尽量哦~
一个放置在没有摩擦力桌面上的水平弹簧,于其不能拉伸的形态（应该就是说此时是保持静止放置的状态）被拉伸了17厘米,并附带一个1千克的块体.这个系统被释放的瞬间,弹簧由静止状态被压缩了3.4厘米
它的最终势能与最初势能相比发生了怎样的变化（按最后到最初的比率给出你的答案）