各位板友好~有道題目因為有點看不太懂，所以希望各位板友可以幫幫忙~~~
問題是這樣的(因為怕翻譯有誤所以用原文的~)
A swimming pool is filled with water (total mass M)to a height h. Explain
why the gravitational potential energy of the water is 1/2Mgh. Where does the
factor of 1/2 come from? How much work be done to fill the pool, if there
supply of water at ground level? What does this have to do with capacitors?
第一個問題我是有比較直觀的答案，但是又怕這樣不夠嚴謹，至於後面兩個問題就真的不
太懂要怎麼解決了~ 希望有哪位好心的板友可以幫幫我的忙~~謝謝囉~~!!
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