足够数量的同等质量的扑克牌平行但不互相重叠接触地排成一排(每张牌相互之间的距离很近,可以忽略),现将一枪口置于第一张牌前面.已知:质量为m、初速为n 的子弹可以射穿a张纸牌.求
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![足够数量的同等质量的扑克牌平行但不互相重叠接触地排成一排(每张牌相互之间的距离很近,可以忽略),现将一枪口置于第一张牌前面.已知:质量为m、初速为n 的子弹可以射穿a张纸牌.求](/uploads/image/z/3267132-60-2.jpg?t=%E8%B6%B3%E5%A4%9F%E6%95%B0%E9%87%8F%E7%9A%84%E5%90%8C%E7%AD%89%E8%B4%A8%E9%87%8F%E7%9A%84%E6%89%91%E5%85%8B%E7%89%8C%E5%B9%B3%E8%A1%8C%E4%BD%86%E4%B8%8D%E4%BA%92%E7%9B%B8%E9%87%8D%E5%8F%A0%E6%8E%A5%E8%A7%A6%E5%9C%B0%E6%8E%92%E6%88%90%E4%B8%80%E6%8E%92%EF%BC%88%E6%AF%8F%E5%BC%A0%E7%89%8C%E7%9B%B8%E4%BA%92%E4%B9%8B%E9%97%B4%E7%9A%84%E8%B7%9D%E7%A6%BB%E5%BE%88%E8%BF%91%2C%E5%8F%AF%E4%BB%A5%E5%BF%BD%E7%95%A5%EF%BC%89%2C%E7%8E%B0%E5%B0%86%E4%B8%80%E6%9E%AA%E5%8F%A3%E7%BD%AE%E4%BA%8E%E7%AC%AC%E4%B8%80%E5%BC%A0%E7%89%8C%E5%89%8D%E9%9D%A2.%E5%B7%B2%E7%9F%A5%EF%BC%9A%E8%B4%A8%E9%87%8F%E4%B8%BAm%E3%80%81%E5%88%9D%E9%80%9F%E4%B8%BAn+%E7%9A%84%E5%AD%90%E5%BC%B9%E5%8F%AF%E4%BB%A5%E5%B0%84%E7%A9%BFa%E5%BC%A0%E7%BA%B8%E7%89%8C.%E6%B1%82)
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