f.4 phys..
2008-10-20 1:16 am
A ball, which is initially at rest, is released at point X and falls freely under gravity. It passes point Y and point Z, which are 150m apart. If it takes 5s for the ball to reach point Z from point Y, how long does it take to fall from point X to point Y?
回答 (1)
2008-10-20 5:47 am
收錄日期: 2021-04-13 16:10:32
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https://hk.answers.yahoo.com/question/index?qid=20081019000051KK01774