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utngo007
2 năm trước
caau1 lò xo có chiều dài tự nhiên l0= 50cm, độ cứng là 60N/m người ta cắt lò xo này thành hai lò xo có chiều dài tự nhiên theo tỉ lệ là l1/l2=3/2. Xác định độ cứng của hai lò xo tạo thành.
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