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Cucbotnho
2 năm trước
Trong các vật sau đây, vật nào không có thế năng? A. Viên đạn đang bay. B. Lò xo để tự nhiên ở một độ cao so với mặt đất. C. Hòn bi đang lăn trên mặt đất nằm ngang. D. Lò xo bị ép đặt ngay trên mặt đất.
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