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thuyet2k5
2 năm trước
Động cơ của một ô tô thực hiện lực kéo không đổi là 4200N. Trong 45 giây ô tô đi được quãng đường 810m coi chuyển động của ô tô là đều. Tính vận tốc của ô tô và công của lực kéo
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