من طرف A car moved on a st. road from a station A to another B with uniform velocity 7 5km I h, then it returned back from B to A on the same road with uniform velocity 50km I h. Find the average velocity during the whole trip given that AB = 90km.
نسعى لخلق جيل يفكر تفكيراً علمياً ليرفع مصر لمرتبة الدول الكبرى
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