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phubui111sg
2 năm trước
Hệ hai vật có khối lượng m1= 2kg và m2= 1kg chuyển động với các vận tốc v1= 4m/s và v2= 2m/s. Nếu hai chuyển động ngược chiều thì độ lớn động lượng của hệ bằng bao nhiêu?
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