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lemanhlinh.catd
2 năm trước
Một vật nặng rơi tự do từ độ cao 45m xuống đất. Lấy g = 10 m/s2. Vận tốc của vật sau thả được 2s là: A. 20 m/s B. 30 m/s C. 90 m/s D. 45 m/s
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