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Gaokao Physics Practice Question

一根轻质弹性绳的两端分别固定在水平天花板上相距 $80 \mathrm{~cm}$ 的两点上, 弹性绳的原长也为 $80 \mathrm{~cm}$ 。将一钩码挂在弹性绳的中点, 平衡时弹性绳的总 长度为 $100 \mathrm{~cm}$; 再将弹性绳的两端缓慢移至天花板上的同一点, 则弹性绳的 总长度变为（弹性绳的伸长始终处于弹性限度内）

  1. A.$86 \mathrm{~cm}$
  2. B.$92 \mathrm{~cm}$
  3. C.$98 \mathrm{~cm}$
  4. D.$104 \mathrm{~cm}$

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