小球从a点抛出时具有300J的机械能,其中有动能为200J,小球经过b,c两点落到地面上的d点,b点是最高点,a,c在同一水平面内,不计空气阻力,则( ) A.小球在b点的动能为200J B.小球在c点的重力势能为100J
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![小球从a点抛出时具有300J的机械能,其中有动能为200J,小球经过b,c两点落到地面上的d点,b点是最高点,a,c在同一水平面内,不计空气阻力,则( ) A.小球在b点的动能为200J B.小球在c点的重力势能为100J](/uploads/image/z/8672289-33-9.jpg?t=%E5%B0%8F%E7%90%83%E4%BB%8Ea%E7%82%B9%E6%8A%9B%E5%87%BA%E6%97%B6%E5%85%B7%E6%9C%89300J%E7%9A%84%E6%9C%BA%E6%A2%B0%E8%83%BD%2C%E5%85%B6%E4%B8%AD%E6%9C%89%E5%8A%A8%E8%83%BD%E4%B8%BA200J%2C%E5%B0%8F%E7%90%83%E7%BB%8F%E8%BF%87b%2Cc%E4%B8%A4%E7%82%B9%E8%90%BD%E5%88%B0%E5%9C%B0%E9%9D%A2%E4%B8%8A%E7%9A%84d%E7%82%B9%2Cb%E7%82%B9%E6%98%AF%E6%9C%80%E9%AB%98%E7%82%B9%2Ca%2Cc%E5%9C%A8%E5%90%8C%E4%B8%80%E6%B0%B4%E5%B9%B3%E9%9D%A2%E5%86%85%2C%E4%B8%8D%E8%AE%A1%E7%A9%BA%E6%B0%94%E9%98%BB%E5%8A%9B%2C%E5%88%99%28+%29+A.%E5%B0%8F%E7%90%83%E5%9C%A8b%E7%82%B9%E7%9A%84%E5%8A%A8%E8%83%BD%E4%B8%BA200J+B.%E5%B0%8F%E7%90%83%E5%9C%A8c%E7%82%B9%E7%9A%84%E9%87%8D%E5%8A%9B%E5%8A%BF%E8%83%BD%E4%B8%BA100J)
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