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que1973
2 năm trước
a) Nói công suất của một máy cày là 15000 W điều đó có ý nghĩa gì? b) Một lực sĩ cử tạ nâng quả tạ trọng lượng 1200 N lên cao 1,8 m trong thời gian 3 s. Trong trường hợp này lực sĩ đã hoạt động với công suất là bao nhiêu?
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