如图所示,轻绳一端系一小球,另一端固定于O点,在O点正下方的P点订一颗钉子,使悬线拉紧与竖直方向成一角度,然后由静止释放小球,当悬线碰到钉子时(BCD)A.小球的瞬时速度突然变大B.小球的
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![如图所示,轻绳一端系一小球,另一端固定于O点,在O点正下方的P点订一颗钉子,使悬线拉紧与竖直方向成一角度,然后由静止释放小球,当悬线碰到钉子时(BCD)A.小球的瞬时速度突然变大B.小球的](/uploads/image/z/12258990-54-0.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E8%BD%BB%E7%BB%B3%E4%B8%80%E7%AB%AF%E7%B3%BB%E4%B8%80%E5%B0%8F%E7%90%83%2C%E5%8F%A6%E4%B8%80%E7%AB%AF%E5%9B%BA%E5%AE%9A%E4%BA%8EO%E7%82%B9%2C%E5%9C%A8O%E7%82%B9%E6%AD%A3%E4%B8%8B%E6%96%B9%E7%9A%84P%E7%82%B9%E8%AE%A2%E4%B8%80%E9%A2%97%E9%92%89%E5%AD%90%2C%E4%BD%BF%E6%82%AC%E7%BA%BF%E6%8B%89%E7%B4%A7%E4%B8%8E%E7%AB%96%E7%9B%B4%E6%96%B9%E5%90%91%E6%88%90%E4%B8%80%E8%A7%92%E5%BA%A6%2C%E7%84%B6%E5%90%8E%E7%94%B1%E9%9D%99%E6%AD%A2%E9%87%8A%E6%94%BE%E5%B0%8F%E7%90%83%2C%E5%BD%93%E6%82%AC%E7%BA%BF%E7%A2%B0%E5%88%B0%E9%92%89%E5%AD%90%E6%97%B6%EF%BC%88BCD%EF%BC%89A.%E5%B0%8F%E7%90%83%E7%9A%84%E7%9E%AC%E6%97%B6%E9%80%9F%E5%BA%A6%E7%AA%81%E7%84%B6%E5%8F%98%E5%A4%A7B.%E5%B0%8F%E7%90%83%E7%9A%84)
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