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buituananh
2 năm trước
Hai vật có khối lượng m và 2m chuyển động trên một mặt phẳng với vận tốc có độ lớn lần lượt là V và V/2 theo hai hướng vuông góc nhau. Tổng động lượng của hệ hai vật có độ lớn là bao nhiêu ? A. mV B. 2mV C. 3/2mV D. Căn2 mV
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