如图所示,小物块位于半径为R的半球顶端,若给小物块以水平初速

如图所示,小物块位于半径为R的半球顶端,若给小物块以水平初速度v0时,物块对球顶恰无压力,则以下说法中不正确的是(   )

A.物块立即离开球面做平抛运动

B.物块落地时水平位移为R

C.初速度v0=

D.物块落地速度方向与地面成45°角

 

答案

D

解析:略

 

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