A girl walks along a straight road from a point A to a point B with an avrage speed 1ms-1.She isthen returns fromB to A along
The same road with an average speed of2ms-1.Find the average speed of the girl for the whole journey.
Physics question(Ans is 1.33,求steps)?
2016-11-26 10:32 am
回答 (1)
2016-11-26 4:09 pm
thx a lot
收錄日期: 2021-04-11 21:33:25
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