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duphuaction2911
2 năm trước
1 vật chuyển động trên đoạn đường dài 50m, nửa đoạn đường đầu đi với vận tốc 5m/s, nửa đoạn sau với vận tốc 3m/s.tìm thời gian vật chuyển đọng trên cả quãng đường
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