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liamkhanhlinh
2 năm trước
Một hòn bi có khối lượng 50g chuyển động đều vs vận tốc 10,8km/h trên một mặt phẳng nhẵn nằm ngang (coi như không có ma sát và sức cản của không khí). Công của viên bi là bao nhiêu?
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