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3
جسم كتلته ك = \left(2ن\ +\ 5\right) كجم ومتجه موضعه \overline{ر}\ =\ \left(\frac{1}{2}\ ن2\ +\ ن\ -\ 5\ \right)\ \overline{ى} حيث \ \overline{ى} متجه وحدة ثابت , الازاحة مقاسة بالمتر , ن بالثانية اوجد :
ا- متجهى السرعة والعجلة عند اى لحظة زمنية ن .
ب- مقدار القوة المؤثرة على الجسم عند ن = 10 ث .
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