如图所示,质量为M=2kg的足够长的木板A静止在水平地面上,其上表面水平,木板A与地面如图所示,质量为M=2kg的足够长的木板A静止在水平地面上,其上表面水平,木板A与地面间的动摩擦因数为μ=0.1,
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