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سيارة كتلتها 2 طن تتحرك على طريق  افقى بسرعة  منتظمة  108 كم / س ضد 

مقاومات تعادل 15 ث  كجم  لكل طن  من الكتلة 

احسب قدرة التها بالحصان

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