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اذا اثرت قوة مقدارها  40 نيوتن على جسم كتلته 8 كجم لمدة 5 ثوان  فان مقدار 

التغيرؤ فى سرعة الجسم فى نفس اتجاه القوة يساوى ............. م/ ث 

ا- 64

ب- 200

ج- 40

د-25

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