如图所示.一根轻质弹簧上端固定弹簧的下端位置为c点在下端挂一个质量为m的物体物体的大小可以忽略.静止时物体位于a点将物体�下拉至b点后 Template




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tomski如图所示.一根轻质弹簧上端固定弹簧的下端位置为c点在下端挂一个质量为m的物体物体的大小可以忽略.静止时物体位于a点将物体�下拉至b点后 coloring