题目内容
某星球的质量为地球质量的9倍,半径是地球半径的一半。若在地球上h高处平抛一物体,物体的落地点与抛出点的水平距离为60m,那么在该星球上,从同样高度以同样的初速度平抛物体,物体的落地点与抛出点的水平距离为:( )
A.10m | B.15m | C.40m | D.90m |
A
由平抛运动公式可知,射程x=v0t=v0
,即v0、h相同的条件下x∝
,又由g=
,可得
=
(
)2=
×(
)2=
,所以
=
=
,
=10 m,选项A正确
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135938473587.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135938661396.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135938723651.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135938863598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135938926651.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135939066557.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135939129340.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135939207345.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135939285422.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135939472543.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135939550639.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135939597336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135939659395.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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