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binhhaitran2k1
2 năm trước
khi người ta treo quả cân có khối lượng 300g vào đầu dưới của một lò xo có đầu trên cố định thì lò xo dài 31 cm. khi treo thêm quả cân 200g nữa vào đầu dưới của lò xo thì chiều dài của nó là 33 cm. lấy g = 10m/s^2. chiều dài tự nhiên và độ cứng của lò xo lần lượt là bao nhiêu?
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