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2 năm trước
27. Một quả dừa có trọng lượng 25N rơi từ trên cây cách mặt đất 8m. Công của trọng lực là bao nhiêu? A) 160J B) 180J C)200J D) 220J 28. Một ô tô chuyển động đều. Lực kéo của động cơ là 800N. Độlớn của lực ma sát tác dụng lên các bánh xe là: A) 1600N; B) 400N; C) 800N; D) 8000N 3. Một học sinh đi bộ từ nhà đến trường với vận tốc 2m/s, mất thời gian 20 phút. Hỏi khoảng cách từ nhà đến trường là bao nhiêu? 4. Hai người đạp xe. Người thứ nhất đi quãng đường 300m hết 1 phút, người thứ hai đi quãng đường 7,5 km hết 0,5 h. Hỏi: a) Người nào đi nhanh hơn? b) Nếu hai người khởi hành 1 lúc và đi cùng chiều thì sau 20 phút hai người cách nhau bao nhiêu km?
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