问题如图所示】用质量为M的铁锤沿水平方向将质量为m,长度为l的铁钉敲入木板
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![问题如图所示】用质量为M的铁锤沿水平方向将质量为m,长度为l的铁钉敲入木板](/uploads/image/z/3573666-18-6.jpg?t=%E9%97%AE%E9%A2%98%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E3%80%91%E7%94%A8%E8%B4%A8%E9%87%8F%E4%B8%BAM%E7%9A%84%E9%93%81%E9%94%A4%E6%B2%BF%E6%B0%B4%E5%B9%B3%E6%96%B9%E5%90%91%E5%B0%86%E8%B4%A8%E9%87%8F%E4%B8%BAm%2C%E9%95%BF%E5%BA%A6%E4%B8%BAl%E7%9A%84%E9%93%81%E9%92%89%E6%95%B2%E5%85%A5%E6%9C%A8%E6%9D%BF)
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