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2 năm trước
Câu 1:Một hòn đá nặng 3 kg được đặt nằm im trên đất. Hỏi có những lực nào đã tác dụng vào hòn đá ? Kể tên ? Sau đó hãy vẽ hình biểu diễn lực hút Trái Đất tác dụng lên hòn đá đó. (tỉ xích tự chọn)
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