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iuiyikhikkh
2 năm trước
Từ mặt đất, một vật được ném lên thẳng đứng với vận tốc ban đầu v0 = 10m/s. Bỏ qua sức cản của không khí . Cho g = 10m/s2. Ở độ cao nào thế năng bằng động năng ? Bằng 4 lần động năng ?. A. 2,5m; 4m. B. 2m; 4m. C. 10m; 2m. D. 5m; 3m.
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