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2 năm trước
Một người dùng búa tác dụng một lực 450 N vào một cái đinh làm nó ngập sâu vào gỗ một đoạn 1 cm. Nếu người đó dung lực 430 N thì phải đóng 2 lần đinh mới ngập sâu vào gỗ 1 cm. Đóng đinh bằng cách nào ít tốn công hơn? vì sao?
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