[解題] 定力做功？變力做功？
1.年級：高二
2.科目：物理
3.章節：CH8 功與能
4.題目：
http://i.imgur.com/rwT3l8p.jpg
5.想法：
看到題目第一個想法就是變力做功，但題目詳解是定力
想不出哪裡有問題，為什麼做出來差了0.1J
想了兩分鐘決定跟學生說我下禮拜回答他
兩天了還是想不出來為什麼用變力解不出來
拜託各位高手幫我看看哪裡有問題
ps 我知道我算的是木塊的功 但這題施力做功跟木塊得功應該是相同吧？
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※ 編輯: DearDaniel (123.192.19.152), 04/11/2016 16:02:31
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