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duc_hp_9x
2 năm trước
Một lò xo thẳng đứng, đầu dưới cố định đầu trên đỡ một vật có khối lượng 8 kg. Lò xo có độ cứng k = 800 N/m. Lấy g ==10m/s². Tại vị trí cân bằng nén thêm 30 cm rồi thả nhẹ nhàng. Xác đinh thế năng của lò xo ngay lúc đó. Tính công của lực đàn hồi đã thực hiện.
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