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اثرت قوة ثابتة   $\overline{ق}$ق  على جسيم بحيث كان متجه ازاحته يعطى كدالة فى الزمن  ن بالعلاقة 

$\overline{ف}$ف  = (3 ن2 + ن ) $\overline{س}$س - 4ن  $\overline{ص}$ص  حيث $\overline{س}\ ,\ \overline{ص}$س , ص  متجها وحدة متعامدين  اوجد $\overline{ق}$ق  تساوى 165 

ارج / ث عندما  ن = 9 ثانية  علما بان ف مقيسة بالسنتمتر  , $\overline{ق}$ق مقيسة بالداين 

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