urgen physics motions40points
2010-09-26 7:07 pm
圖片參考：http://imgcld.yimg.com/8/n/HA00178417/o/701009260039813873373680.jpg
(a)Does the carchange its travelling direction? Explain briefly
回答 (2)
2010-09-27 1:01 am
✔ 最佳答案
Yes, the car changes direction at t = 30 s.because its velocity changes from positive to negative, indicating a change in itstravelling direction.
2010-09-26 7:17 pm
是,因為速度正表示它向前行,速度負表示它向後行. (速度零當然是唔郁啦!)
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100926000051KK00398