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Loga1231
2 năm trước
Dưới tác dụng của một lực bằng 4000N một chiếc xe chuyển động với vận tốc 6m/s trong 5phút trên đoạn đường từ A đến B. a) Tính công trên đoạn đường AB? b) Nếu giữ nguyên lực tác dụng, nhưng vận tốc của xe là 12 m/s thì công của lực kéo trên đoạn đường AB thay đổi như thế nào? c) So sánh công suất của xe ở hai trường hợp trên (câu a và b).
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