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العلوم الخامس الابتدائي الفصل الدراسي الثاني

أخر المواضيع من قسم : اسألني

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عند سقوط كرة من ارتفاع ما لا ترتد الى الارتفاع نفسه الذي سقطت منه كيف تحقق هذه الحالة مبدا حفظ الطاقة

أخر المواضيع من قسم : اسألني