نقل قول:
نوشته اصلی توسط dane
The following three graphs demonstrate the point made earlier about how topspin and backspin affect the trajectory of the ball after bouncing. As can be seen in the graph, a ball hit with topspin bounces at a lower angle relative to the ground than a ball hit with no spin. Conversely, a ball hit with backspin, bounces with an angle higher than a ball hit with no spin. Both of these strokes are important parts of the tennis game and have many different uses in different match situations
محمد جان میشه بگید کجا این مطلب رو نوشته بود , من الان دارم 1 ساعته اون لینکی که شما گذاشتی رو می خونم
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فقط صفحشو بگی ممنون می شم.