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thaitrinh2042019
2 năm trước
Một viên đạn khối lượng 10g đang bay ngang với vận tốc không đổi 240 m/s. Viên đạn đến xuyên qua một tấm gỗ dày và chui sâu vào gỗ 8cm. Xác định lực cản (trungbình) của gỗ?
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