如图所示,甲、乙两物体叠放在水平面上,用水平力F拉物体乙,物体乙

如图所示,甲、乙两物体叠放在水平面上,用水平力F拉物体乙,物体乙未动,它们仍保持相对静止,甲、乙两物体间接触面为水平面,则乙物体受力的个数为(     )

A.3个          B.4个

C.5个          D.6个

 

答案

B

解析:略

 

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