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Tension in an accelerating system and pie in the face http://www.khanacademy.org/video/tension-in-an-accelerating-system-and-pie-in-the-face ---------------------------------------------------- يتناول هذا الفيديو أمثلة حول تسارع جسم على سطح مائل ---------------------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org