圖片參考：http://imgcld.yimg.com/8/n/HA00693088/o/701112110035913873409810.jpg
請各位師兄師姐指教! 謝謝!!
更新1:
Average speed: A. 0.5ms-1, B. 1ms-1, C, 0.37, D. 0.75.... Magnitude of average velocity: A. 0.37, B. 0.75, C. 0.5, D. 1
What is the average speed?
2011-12-11 10:33 pm
圖片參考：http://imgcld.yimg.com/8/n/HA00693088/o/701112110035913873409810.jpg
請各位師兄師姐指教! 謝謝!!
回答 (1)
2011-12-11 11:01 pm
✔ 最佳答案
The total distance travelled from I to IV = 28 units on the graphSince the given scale is 4 units = 2 m.
hence, the total distance travelled = 28/2 m = 14 m
Average speed = 14/18 s = 0.778 m/s
By joining point I and point IV,
the displacement = square-root[20^ + 8^2] units = 21.54 units = 10.77 m
hence, average velocity = 10.77/18 m/s = 0.598 m/s
收錄日期: 2021-04-29 17:43:37
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111211000051KK00359