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جسيم يتحرك فى خط مستقيم  بحيث كانت عجلته  جـ تعطى كدالة فى الزمن  بالعلاقة جـ = 2 ن - 6

حيث جـ مقاسة م / ث2 , الزمن ن بالثانية  فان كان التغير فى كمية حركة الجسيم خلال الفترة 

3\leن\le5\     يساوى 32 كجم م/ث فاحسب كتلة الجسم 

 

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