下面的几个速度中表示平均速度的是                      

下面的几个速度中表示平均速度的是                                 (    )

A.子弹射出枪口的速度是800 m/s,以 790 m/s的速度击中目标

B.汽车从甲站行驶到乙站的速度是40 km/h

C.汽车通过站牌时的速度是72 km/h

D.小球第3 s末的速度是6 m/s.

 

答案

B

解析:略

 

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