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nguyenthidunghanh283
2 năm trước
một oto có khối lượng 2 tấn bắt đầu chuyển động nhanh dần đều trên đường nằm ngang với một lực kéo 2000n sau thời gian 5s vận tốc của xe là 15m/s lấy g=10m/s Tính độ lớn của lực cản của mặt đường lên xe
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