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khanglocuong
2 năm trước
Một vật được thảrơi tựdo không vận tốc đầu từđộcao h biết trong 7s cuối cùng vật rơi được 385m cho g=10m/s2.Tính thời gian cần thiết đểvật rơi 85m cuối cùng
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