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2 năm trước
: Một vật thả rơi tự do từ độ cao h xuống đất. Trong hai giây cuối cùng trước khi chạm đất, vật rơi được 3 /4 h . Lấy g = 10m/s2 . Độ cao h là A. 80m B. 20m C. 8,9m D. 60m ( GIẢI CHI TIẾT )
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