[問題] 力學能守恒的問題
一顆質量為M之球由高H處落地
設過程中無非保守力作功
則依力學能守恆
可列式
MgH = 1/2MV^2 (V為落地時的速度)
若在一速度為v之座標系觀察
是否可列式為
1/2Mv^2 + MgH = 1/2M(V+v)^2
但若將二式聯立
1/2MVv*2 = 0
明顯不合理
請問以上推論是哪裡不正確
難道在另一個座標系力學能守恆不成立
謝謝
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