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ngothihau46
2 năm trước
Một vật nhỏ có khối lượng 100g gắn vào đầu một lò xo đàn hồi có độ cứng 200N/m, đầu kia của lò xo được gắn cố định. Hệ được đặt trên một mặt phẳng ngang không ma sát. Kéo vật giãn ra 5cm so với vị trí ban đầu rồi thả nhẹ nhàng. Tại vị trí nào động năng bằng 2 lần thế năng .Tính vận tốc tại vị trí đó?
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