如图所示,ABC是光滑轨道,BC段是半径为 r 的半圆弧,BC直径竖直.今让一小球从A点(与C点在同一水平线上)由静止开始沿轨道ABC运动,则( )A.小球恰能到达C点 B.小球不可能到达C点 C.
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![如图所示,ABC是光滑轨道,BC段是半径为 r 的半圆弧,BC直径竖直.今让一小球从A点(与C点在同一水平线上)由静止开始沿轨道ABC运动,则( )A.小球恰能到达C点 B.小球不可能到达C点 C.](/uploads/image/z/5465096-8-6.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2CABC%E6%98%AF%E5%85%89%E6%BB%91%E8%BD%A8%E9%81%93%2CBC%E6%AE%B5%E6%98%AF%E5%8D%8A%E5%BE%84%E4%B8%BA+r+%E7%9A%84%E5%8D%8A%E5%9C%86%E5%BC%A7%2CBC%E7%9B%B4%E5%BE%84%E7%AB%96%E7%9B%B4%EF%BC%8E%E4%BB%8A%E8%AE%A9%E4%B8%80%E5%B0%8F%E7%90%83%E4%BB%8EA%E7%82%B9%EF%BC%88%E4%B8%8EC%E7%82%B9%E5%9C%A8%E5%90%8C%E4%B8%80%E6%B0%B4%E5%B9%B3%E7%BA%BF%E4%B8%8A%EF%BC%89%E7%94%B1%E9%9D%99%E6%AD%A2%E5%BC%80%E5%A7%8B%E6%B2%BF%E8%BD%A8%E9%81%93ABC%E8%BF%90%E5%8A%A8%2C%E5%88%99%EF%BC%88%E3%80%80%E3%80%80%EF%BC%89A%EF%BC%8E%E5%B0%8F%E7%90%83%E6%81%B0%E8%83%BD%E5%88%B0%E8%BE%BEC%E7%82%B9+B%EF%BC%8E%E5%B0%8F%E7%90%83%E4%B8%8D%E5%8F%AF%E8%83%BD%E5%88%B0%E8%BE%BEC%E7%82%B9+C%EF%BC%8E)
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