HKCEE physics mc 2011
2012-06-17 1:56 am
圖片參考：http://imgcld.yimg.com/8/n/HA00647229/o/701206160034513873410930.jpg
Why is (3) wrong?
But according to law of conservation of mechanical energy, the ball cannot passT if T is higher than P.
回答 (1)
2012-06-17 3:05 am
✔ 最佳答案
Notice that the ball has a certain speed at P, i.e. it possesses certain amount of kinetic energy (say, E) when it is at P.Thus, if E >= the difference in potential energy between the levels P and T, the ball can reach T.
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120616000051KK00345