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Calculating Average Velocity or Speed http://www.khanacademy.org/video/calculating-average-velocity-or-speed -------------------------------------------------------------- يتناول هذا الفيدو مسألة حول معدل السرعة المتجهة او القياسية -------------------------------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org