题目内容
400m 20m/s
解法一、
V0="36km/h=10m/s, " a=1m/s2
x=v0t+
at2=10m/s×20s+
×1 m/s2 ×400 s2=400m……………………4
=x/t=400m/20s=20m/s………………………………………………………4
解法二、
V0="36km/h=10m/s, " a=1m/s2
v=v0+at=30m/s………………………………………………………………2
=(v0+v)/2=20m/s……………………………………………………………3
X=
t=20m/s×20s=400m……………………………………………………3
V0="36km/h=10m/s, " a=1m/s2
x=v0t+
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120213345225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120213345225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120213376194.gif)
解法二、
V0="36km/h=10m/s, " a=1m/s2
v=v0+at=30m/s………………………………………………………………2
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120213376194.gif)
X=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120213376194.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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