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المعادلات التفاضلية: Mathematics Tawjihi question with answer

A Tawjihi Mathematics question (التكامل) with the answer and worked steps.

From the Tawjihi question bank: Mathematics · التكامل

تتحرك سيارة بحيث v(t)=100.5vv\prime(t)=10-0.5v. أجد سرعتها بعد tt ثانية إذا بدأت من السكون.

المعادلات التفاضلية

The answer

نفصل: dv100.5v=dt\frac{dv}{10-0.5v}=dt. بالتكامل: 2ln100.5v=t+C-2\ln|10-0.5v|=t+C، أي 100.5v=Aet/210-0.5v=Ae^{-t/2}. من v(0)=0v(0)=0 نحصل على A=10A=10. إذن v(t)=20(1et/2)v(t)=20(1-e^{-t/2}).

Explanation

نموذج اقتراب من سرعة حدية مع شرط ابتدائي.

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