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nhungtrbb
2 năm trước
Một vật có khối lượng 3kg đang chuyển động với vận tốc V1 = 20m/s thì chịu tác dụng của lực hãm trong thời gian 0,05g vận rốc của vật còn là 15m/s a, Tính động lượng trước và sau khi chịu tác dụng của lực hãm b, Tính lực hãm
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