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ngocd6999
2 năm trước
Một vật có khối lượng 500g rơi tự do từ độ cao 100m xuống đất. Chọn mốc thế năng ở mặt đất. Lấy g= 10 m/s^2 A) Tìm cơ năng B) Sau khi rơi bao lâu vật có Wt =4Wđ ?
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