如图12,ABCD为一竖直放置的光滑轨道,其中CD是半径为R的半圆形轨道,BC为水平轨道,长度恰为2R,将一小球于A点从静止释放,小球从D点平抛后恰好落在B点,求:(1)小球到D点时的速度;(2)小球
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![如图12,ABCD为一竖直放置的光滑轨道,其中CD是半径为R的半圆形轨道,BC为水平轨道,长度恰为2R,将一小球于A点从静止释放,小球从D点平抛后恰好落在B点,求:(1)小球到D点时的速度;(2)小球](/uploads/image/z/6754447-55-7.jpg?t=%E5%A6%82%E5%9B%BE12%2CABCD%E4%B8%BA%E4%B8%80%E7%AB%96%E7%9B%B4%E6%94%BE%E7%BD%AE%E7%9A%84%E5%85%89%E6%BB%91%E8%BD%A8%E9%81%93%2C%E5%85%B6%E4%B8%ADCD%E6%98%AF%E5%8D%8A%E5%BE%84%E4%B8%BAR%E7%9A%84%E5%8D%8A%E5%9C%86%E5%BD%A2%E8%BD%A8%E9%81%93%2CBC%E4%B8%BA%E6%B0%B4%E5%B9%B3%E8%BD%A8%E9%81%93%2C%E9%95%BF%E5%BA%A6%E6%81%B0%E4%B8%BA2R%2C%E5%B0%86%E4%B8%80%E5%B0%8F%E7%90%83%E4%BA%8EA%E7%82%B9%E4%BB%8E%E9%9D%99%E6%AD%A2%E9%87%8A%E6%94%BE%2C%E5%B0%8F%E7%90%83%E4%BB%8ED%E7%82%B9%E5%B9%B3%E6%8A%9B%E5%90%8E%E6%81%B0%E5%A5%BD%E8%90%BD%E5%9C%A8B%E7%82%B9%2C%E6%B1%82%EF%BC%9A%EF%BC%881%EF%BC%89%E5%B0%8F%E7%90%83%E5%88%B0D%E7%82%B9%E6%97%B6%E7%9A%84%E9%80%9F%E5%BA%A6%EF%BC%9B%EF%BC%882%EF%BC%89%E5%B0%8F%E7%90%83)
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