99年佐級基本電學大意第22題 - 考試

By Jessica
at 2018-11-19T20:05
at 2018-11-19T20:05
Table of Contents
https://i.imgur.com/KuHw3GU.jpg
想法:
仿照#1RrjZMLI,先減再平方,即
W = 1/2*200u*(100-60)^2 = 0.16(J)
結果答案不是(A)而是(C),怎麼會這樣?
請各位高手解惑,謝謝。
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