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範例:鉛直拋體與相遇問題

一石自高為H之懸崖自由落下,同時自崖底以初速vo鉛直上拋一球,則:(1)若球之速度夠大,則二者在運動開始後多久相遇?(2)兩者在空中相遇的條件為何?(3)若要在球上升時之空中相遇,vo又受何限制?(4)若要在球下降時之空中相遇,vo又受何限制?(5)若相遇時,兩者速率相等,則相遇點的高度為何?

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