ترك جسم كتلته كجم ليهبط من السكون على خط اكبر ميل لمستوى خشن يميل
على الافقى بزاوية جيبها \frac{3}{5} .
اذا اصبحت سرعة الجسم 4.9 م / ث بعد 2.5 ث من بدء الحركة فاوجد معامل
الاحتكاك الحركى بين الجسم المستوى
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