1,质量为三十克的子弹以500m/s的速率作水平方向的射入沙袋中,并达到深度为20厘米处,求沙袋对子弹的平均
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![1,质量为三十克的子弹以500m/s的速率作水平方向的射入沙袋中,并达到深度为20厘米处,求沙袋对子弹的平均](/uploads/image/z/12291061-13-1.jpg?t=1%2C%E8%B4%A8%E9%87%8F%E4%B8%BA%E4%B8%89%E5%8D%81%E5%85%8B%E7%9A%84%E5%AD%90%E5%BC%B9%E4%BB%A5500m%2Fs%E7%9A%84%E9%80%9F%E7%8E%87%E4%BD%9C%E6%B0%B4%E5%B9%B3%E6%96%B9%E5%90%91%E7%9A%84%E5%B0%84%E5%85%A5%E6%B2%99%E8%A2%8B%E4%B8%AD%2C%E5%B9%B6%E8%BE%BE%E5%88%B0%E6%B7%B1%E5%BA%A6%E4%B8%BA20%E5%8E%98%E7%B1%B3%E5%A4%84%2C%E6%B1%82%E6%B2%99%E8%A2%8B%E5%AF%B9%E5%AD%90%E5%BC%B9%E7%9A%84%E5%B9%B3%E5%9D%87)
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