运动�抛出铅球后运动轨迹如图所示.已知ab为轨迹上两点其中a点为最高点不计空气阻力.下列说法正确的是 A.铅球在a点和b点的机械能 Template




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tomski运动�抛出铅球后运动轨迹如图所示.已知ab为轨迹上两点其中a点为最高点不计空气阻力.下列说法正确的是 a.铅球在a点和b点的机械能 coloring