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

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

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

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