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Physics, 18.09.2021 17:00 whiteshawn02

Một con lắc lò xo có độ dài tự nhiên 20cm treo thẳng đứng dao động điều hòa. Ở vị trí cân bằng lò xo bị dãn 3cm, ở vị trí lò xo có độ dài ngắn nhất lò xo bị nén 2cm. Độ dài cực đại của lò xo là:
A. 25cm B. 28cm C. 30cm D. 23cm

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Một con lắc lò xo có độ dài tự nhiên 20cm treo thẳng đứng dao động điều hòa. Ở vị trí cân bằng lò xo...
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