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vuthecong16052005
2 năm trước
hai hòn bi cùng rơi tự do không vận tốc đầu từ các độ cao tương ứng là h1 và h2. Tỉ số vận tốc khi chạm đất của hai hòn bi là v2/v1=2. Tỉ số độ cao h2/h1 là
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