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ntyennhi11a1
2 năm trước
a chiec bo biết dịnh Hỏi tấm ván nào dài nhất? Biết với 4 tấm ván này người đó đã đẩy thùng dầu với các lực nhỏ nhất tương ứng là: F=1000N; F,= 200N; F,= 500N; F-1200N. A. Tấm ván 1 B. Tấm ván 2 ng C. Tấm ván 3 D. Tấm ván 4 một Câu 18. Để đưa các thùng đựng dầu lên xe tải, một người đã lần lượt dùng 4 tấm ván làm mặt phẳng nghiêng.Hỏi tấm ván nào dài nhất ? Biết 4 tấm ván đó đã đẩy thùng dầu với các lực nhỏ nhất tương ứng là : F1 = 1000 N F2 = 200 N , F3 = 500N , F4 = 1200N A . Tấm ván 1 C , Tấm ván 3 B , Tấm ván 2 D. Tấm ván 4
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