A naughty boy throws a ball from a building to the ground. He is 12m above the ground. When will the ball reach the ground if the boy
a) releases the ball from rest?
b) throws the ball vertically downwards at a speed of 4ms^-1?
( Hint: You may first calculate the speed of the ball just before it reaches the ground.)
f.4,,phys,,about a ball..
2008-10-10 6:50 am
回答 (2)
2008-10-10 7:42 am
✔ 最佳答案
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2008-12-04 5:15 am
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收錄日期: 2021-04-13 16:09:03
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081009000051KK02219