静止在光滑水平面上的小车受到恒力F的作用.当小车的质量为m时,经过t秒小车的位移为s.若将小车的质量增加到2m,在同样的恒力F作用下,经过同样的时间t,小车的位移为( )
A、<img src="http://img.wangxiao.cn/examfiles/imgcache/attached/image/20130111/20130111145193299329.jpg" alt="" border="0" />
B、<img src="http://img.wangxiao.cn/examfiles/imgcache/attached/image/20130111/20130111145144864486.jpg" alt="" border="0" />
C、<img src="http://img.wangxiao.cn/examfiles/imgcache/attached/image/20130111/20130111145275477547.jpg" alt="" border="0" />
D、<img src="http://img.wangxiao.cn/examfiles/imgcache/attached/image/20130111/20130111145277187718.jpg" alt="" border="0" />
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