从空中某点以E1 = 1J的初动能水平抛出一小球,小球刚要落地时的动能E2 = 4J,不计空气阻力.则小球刚要落
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![从空中某点以E1 = 1J的初动能水平抛出一小球,小球刚要落地时的动能E2 = 4J,不计空气阻力.则小球刚要落](/uploads/image/z/11153106-18-6.jpg?t=%E4%BB%8E%E7%A9%BA%E4%B8%AD%E6%9F%90%E7%82%B9%E4%BB%A5E1+%3D+1J%E7%9A%84%E5%88%9D%E5%8A%A8%E8%83%BD%E6%B0%B4%E5%B9%B3%E6%8A%9B%E5%87%BA%E4%B8%80%E5%B0%8F%E7%90%83%2C%E5%B0%8F%E7%90%83%E5%88%9A%E8%A6%81%E8%90%BD%E5%9C%B0%E6%97%B6%E7%9A%84%E5%8A%A8%E8%83%BDE2+%3D+4J%2C%E4%B8%8D%E8%AE%A1%E7%A9%BA%E6%B0%94%E9%98%BB%E5%8A%9B.%E5%88%99%E5%B0%8F%E7%90%83%E5%88%9A%E8%A6%81%E8%90%BD)
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