• 2021-04-14
    设弹簧的原长为l0,弹簧刚度系数为k,物块由M1运动至M2 ,弹性力的功为 。http://edu-image.nosdn.127.net/75D3E3E535F3D8AEBA42DE2FE4B0BEBA.png?imageView&thumbnail=520x520&quality=100