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IR-OG-44 求解释

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楼主
发表于 2013-7-18 01:28:24 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
7. A car is travelling on a straightstretch of roadway. Andthe speed of the car is increasing at a constant rate. At time 0 seconds, thespeed of the car is v0 meters per second; 10 seconds later, thefront bumper of the car has traveled 125 meters and the speed of the car is v10meters per second.
Inthe table, selectvalues of v0and v10 that are together consistent with the information provided. Make only two selections, one in eachcolumn.
  
  
V0
V10
A
5
B
18
C
20
D
36
E
72


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沙发
发表于 2013-8-11 21:41:23 | 只看该作者
求好心人解释为什么V均=(V0+V10)/2  ? 多谢了
板凳
发表于 2013-8-11 21:54:47 | 只看该作者
已自解  等差数列
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