请问半径为R的竖直光滑圆轨道内侧底部静止着一个光滑小球,给小球一个冲击使其瞬间获得一个水平初速度v为什么小球能够上到1R/2以下时,小球的速度可为零,而小球能够到达3R/2时,小球速度
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![请问半径为R的竖直光滑圆轨道内侧底部静止着一个光滑小球,给小球一个冲击使其瞬间获得一个水平初速度v为什么小球能够上到1R/2以下时,小球的速度可为零,而小球能够到达3R/2时,小球速度](/uploads/image/z/5579118-54-8.jpg?t=%E8%AF%B7%E9%97%AE%E5%8D%8A%E5%BE%84%E4%B8%BAR%E7%9A%84%E7%AB%96%E7%9B%B4%E5%85%89%E6%BB%91%E5%9C%86%E8%BD%A8%E9%81%93%E5%86%85%E4%BE%A7%E5%BA%95%E9%83%A8%E9%9D%99%E6%AD%A2%E7%9D%80%E4%B8%80%E4%B8%AA%E5%85%89%E6%BB%91%E5%B0%8F%E7%90%83%2C%E7%BB%99%E5%B0%8F%E7%90%83%E4%B8%80%E4%B8%AA%E5%86%B2%E5%87%BB%E4%BD%BF%E5%85%B6%E7%9E%AC%E9%97%B4%E8%8E%B7%E5%BE%97%E4%B8%80%E4%B8%AA%E6%B0%B4%E5%B9%B3%E5%88%9D%E9%80%9F%E5%BA%A6v%E4%B8%BA%E4%BB%80%E4%B9%88%E5%B0%8F%E7%90%83%E8%83%BD%E5%A4%9F%E4%B8%8A%E5%88%B01R%2F2%E4%BB%A5%E4%B8%8B%E6%97%B6%2C%E5%B0%8F%E7%90%83%E7%9A%84%E9%80%9F%E5%BA%A6%E5%8F%AF%E4%B8%BA%E9%9B%B6%2C%E8%80%8C%E5%B0%8F%E7%90%83%E8%83%BD%E5%A4%9F%E5%88%B0%E8%BE%BE3R%2F2%E6%97%B6%2C%E5%B0%8F%E7%90%83%E9%80%9F%E5%BA%A6)
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