[題目] 高中物理-兩球脫離問題
[領域]高中物理 (題目相關領域)
[來源]參考書 (課本習題、考古題、參考書...)
[題目]下述
假設有A.B兩小球.質量分別為m和2m，當兩球相距Ｒ時，
A靜止而B以速度V沿兩球連線方向離去，若兩球僅受彼此間萬有引力影響。
則V值應該多少.才不至於被吸回?
我的想法:
不要被吸回，應該是兩球已經相距無窮遠了，卻還有動能？
先列初總能，應該有彼此的位能與Ｂ球動能。
後來的總能應該只有ＡＢ兩球的動能
ＡＢ兩球後來的速度又可以從動量守衡來找到
-(2Gmm/R)+1/2(mV*V)=1/2(mB*B+2mC*C) B.C為後來的速度
2mV=mB+2mC 動量守衡
請問我這樣列式子有錯嘛???
可是這樣沒辦法實際解出V是多少...
懇請高手指點~
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