(2013河北省石家庄名校质检)如图所示,木块A质量为1kg,木块B的质

2013河北省石家庄名校质检)如图所示,木块A质量为1kg,木块B的质量为2kg,叠放在 水平地面上,AB间的最大静摩擦力为1 NB与地面间的动摩擦系数为0.1,今用水平力F作用于B,则保持AB相对静止的条件是F不超过(g = 10 m/s2(    )

A3 N       B4 N      C5 N     D6 N

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