[問題] 球
應該很多人都已經知道答案，就當做是分享給還沒看過的板友吧~
(所以，如果推文有解答，請恕我上碼喔~ ~^^~ )
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有一顆普通的乒乓球，朝某方向滾動一段距離後完全靜止，如何令它自動朝反方向滾動，
並符合以下條件：
1.不能反彈
2.不能以其他物品碰觸它
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