جسيم يتحرك فى خط مستقيم بسرعة ابتدائية 2 م / ث من نقطة ثابتة , بحيث
كانت جـ = 2 ن - 6 حيث جـ عجلة الحركة مقاسة بوحدة م / ث2 .
اوجد بدلالة ن كل من ع السرعة , س الازاحة
ثم اوجد س عندما ع = 18 م / ث
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