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اذا  اثرت القوتان   \overline{1ق}\ =\ \overline{س}\ +\ 5\ \overline{ص}\ +\ 7\ \overline{ع}\ ,\ \overline{2ق}\ =\ 2\ \overline{س}\ -\ \overline{ص}\ -\ 7\overline{ع} 

على جسيم لفترة زمنية قدرها  2 ثانية فان مقدار دفع  القوى  بوحدة النيوتن  ث يساوى ........................

ا- 5

ب- 10

ج- 25

د- 106

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