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منذ 6 سنوات
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اثرت قوة ق = ( 3 ن + 1 ) نيوتن على جسم ساكن كتلته 4 كجم  مبتدئا حركته من نقطة  الاصل 

على خط مستقيم فان ع بعد 2 ث = .....................................

ا- 2 سم / ث 

ب- 2م / ث 

ج-5م/ث

د-9م/ث

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