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jullyanh2006
2 năm trước
Một chiếc xe chuyển động đều lên dốc, với tốc độ là 6 m/s trong 4 min, lực kéo của động cơ là 5500 N. a/ Tính công thực hiện khi xe lên dốc. b/ Nếu giữ nguyên lực kéo nhưng xe lên dốc với tốc độ 8 m/s thì công thực hiện là bao nhiêu? c/ So sánh công suất của động cơ trong hai trường hợp?
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