[問題]電位和電位能
有兩個題目
第20
http://m.imgur.com/BZPE9Sh
http://m.imgur.com/WnCcOa0
不懂他每個位置的位能怎麼求的
為何四個位置位能都不一樣?
第21
http://m.imgur.com/6ou8d30
不懂他的想法
拜託各位大大了
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