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Vietnam
2 năm trước
Một vật có khối lượng 2 kg rơi tự do. Cho g = 10m/s2, tính a) Động lượng của vật sau giây thứ 3. b)Độ độ biến thiên động lượng của vật trong quá trình rơi từ sau giây thứ 2 đến sau giây thứ 5.
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