The figure below shows a hot air balloon tied to the ground. The ropes are cut at t=0.
圖片參考：http://imgcld.yimg.com/8/n/HA06783028/o/20130214132343.jpg
When the balloon reaches a velocity of 20 ms^(-1) , a sandbag of 50 kg is dropped. Describe briefly the motion of the sandbag and give reasons. Air resistance is not negligible.
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2013-02-14 9:30 pm
回答 (1)
2013-02-15 7:50 am
✔ 最佳答案
The sandbag first goes up, and then falls vertically downward with an acceleration smaller than g, the acceleration due to graviy.
收錄日期: 2021-04-13 19:17:55
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130214000051KK00118