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nguyetnga1972
2 năm trước
hai vật có khối lượng là là 2,5 kg gà 4,5 kg chuyển động ngược chiều nhau với vận tốc là lần lượt là 2 m và 4 m trên giây đến va chạm gần nhau tính độ lớn phương chiều và vận tốc của chúng sau va chạm biết va chạm giữa hai vật là va chạm mềm9
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