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2 vật chuyển động so đồ thị vận tốc thời gian như hình a,nêu đặc điểm chuyển động của mỗi vật b, suy ra thị quãng đg thời gian của mỗi chuyển động từ đồ thị vận tốc c, tính quãng đg vật đi đc
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