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عربة قطار كتلتها 10 اطنان تسير بسرعة 20 م / ث  اصطدمت بعربة  قطار اخرى ساكنة 

كتلتها 10 اطنان  فاذا تحركت العربتان   بعد التصادم  مباشرة  كجسم واحد 

فاحسب سرعتهما المشتركة حينئذ واحسب ايضا طاقة الحركة المفقودة نتيجة 

للتصادم بالجول

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