[問題] 能量跑去哪裡了?
【出處】自己想的
【題目】http://imgur.com/a/Cl16Q
【瓶頸】根據動能-位能定理,1/2mv^2=mgh,此時h=4,代入可以得v,但我卡在,如果要
求A-C的v,就不能用動能-位能定理了吧?這時應該要代1/2mv^2=5F,才能得到正確的v吧?
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推
11/13 15:47, , 1F
11/13 15:47, 1F
→
11/13 15:48, , 2F
11/13 15:48, 2F
推
11/13 17:54, , 3F
11/13 17:54, 3F
→
11/13 17:56, , 4F
11/13 17:56, 4F
→
11/13 17:57, , 5F
11/13 17:57, 5F
推
11/13 18:01, , 6F
11/13 18:01, 6F