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Dung2901
2 năm trước
Một vật có khối lượng bằng 1kg rơi tự do không vận tốc đầu từ độ cao h,lúc có độ cao 10m số với mặt đất vật có vận tốc 10m/s.Lấy g=10m/s bình phương.xác định a.độ cao h b.vận tốc của vật lúc chạm đất.
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