[問題] 發球「跺腳」發出的球質量會比較「重」嗎?
以前有一陣子,發球很愛踩地用地瞪跺腳
發現發出的球,比較沈
但完全不明所以然,請問這方面有做過科學研究嗎?
國際賽茲職業選手,發球好像踩地板也是很大聲
想請教大家,謝謝
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※ 編輯: zkow (140.119.145.30), 06/08/2014 14:21:50
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