Knowledge is power ,

sharing knowledge is powerful

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اذا طلقت رصاصة كتلتها 98 جم افقيا بسرعة 200 م / ث  على حاجز خشبى راسى فاستقرت فيه وكانت مقاومة الخشب للرصاصة ثابتة وتساوى 400 ث كجم فان المسافة التي تغوصها الرصاص داخل الحاجز قبل ان تسكن تساوى ...... سم . 

ا- 100 

ب- 98 

ج- 50 

د- 392 

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