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thienthien.5.2.2003
2 năm trước
tại thời điểm t=0, một vật rắn bắt đầu quay quanh một trục cố định xuyên qua vật với gia tốc ko đổi. Sau 4 s nó quay được 1 góc 20rad. Góc mà vật rắn quay được từ thời điểm 0s đến thời điểm 6s
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