如图1所示,一高度为L的升降机以加速度a匀加速上升,某一时刻从顶板上掉下一颗螺钉,问螺钉经多少时间掉到以向下为正方向:v相对=v钉-v机,
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![如图1所示,一高度为L的升降机以加速度a匀加速上升,某一时刻从顶板上掉下一颗螺钉,问螺钉经多少时间掉到以向下为正方向:v相对=v钉-v机,](/uploads/image/z/6403726-46-6.jpg?t=%E5%A6%82%E5%9B%BE1%E6%89%80%E7%A4%BA%2C%E4%B8%80%E9%AB%98%E5%BA%A6%E4%B8%BAL%E7%9A%84%E5%8D%87%E9%99%8D%E6%9C%BA%E4%BB%A5%E5%8A%A0%E9%80%9F%E5%BA%A6a%E5%8C%80%E5%8A%A0%E9%80%9F%E4%B8%8A%E5%8D%87%2C%E6%9F%90%E4%B8%80%E6%97%B6%E5%88%BB%E4%BB%8E%E9%A1%B6%E6%9D%BF%E4%B8%8A%E6%8E%89%E4%B8%8B%E4%B8%80%E9%A2%97%E8%9E%BA%E9%92%89%2C%E9%97%AE%E8%9E%BA%E9%92%89%E7%BB%8F%E5%A4%9A%E5%B0%91%E6%97%B6%E9%97%B4%E6%8E%89%E5%88%B0%E4%BB%A5%E5%90%91%E4%B8%8B%E4%B8%BA%E6%AD%A3%E6%96%B9%E5%90%91%EF%BC%9Av%E7%9B%B8%E5%AF%B9%EF%BC%9Dv%E9%92%89%EF%BC%8Dv%E6%9C%BA%2C)
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