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lthnhi2109
2 năm trước
Một vật được thảrơi tựdo không vận tốc đầu từđộcao h so với mặt đất. Cho g =10m/s2. Tốc độcủa vật khi chạm đất là 60m/s. Tính quãng đường vật rơi trong bốn giây đầu và trong giây thứtư
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