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http://bim.accesmad.org/educmad25/pluginfile.php/66795/mod_lesson/page_contents/1182/SCH%C3%89MATISER%20des%20FORCES%20%28Gravitation%2C%20poids%2C%20r%C3%A9action%20du%20support%2C%20tension%20dun%20fil%29%20_%20Physique-Chimie.mp4
