一小球从A点由静止开始做匀变速直线运动,若到达B点时速度为v,到

一小球从A点由静止开始做匀变速直线运动,若到达B点时速度为v,到达C点时速度为2v,则ABBC等于(  )

A.1∶1                                      B.1∶2

C.1∶3                                      D.1∶4

【解析】:选C.设物体的加速度为a

v2=2axAB

 (2v)2v2=2axBC

解①②得xABxBC=1∶3.

 

答案

C

 

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