A mass m is attached to a massless spring with a force const

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A mass m is attached to a massless spring with a force constant k.The mass rests on a horizontal frictionless surface.The system is compressed a distance x from the spring's initial position and the released.The momentum of the mass when the spring passes its equilibrium position is given by?

一质量为m的物体连接到不计质量,劲度系数为k的弹簧上.此物体停留在无摩擦的水平面上.从弹簧的初始位置开始压缩一段距离x,然后释放此系统.当弹簧经过平衡位置时,求此物体的动量.
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