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datleyt29102005
2 năm trước
Một oto m=4 tấn chuyển động đều 36km/h trên đường nằm ngang. Cho công suất trung bình là 20 kw a. Tìm hệ số ma sát ? b. Sau đó oto chuyển động nhanh dần đều đi được 250m (vận tốc tại C là 54km/h). Tính công suất oto cuối quãng đường ?
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