13.在一次运动会上某同学抛出铅球的部分运动轨迹如图所示已知在b点时铅球的速度与加速度相互垂直空气阻力忽略不计则下列说法中正确的是 Template




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tomski13.在一次运动会上某同学抛出铅球的部分运动轨迹如图所示已知在b点时铅球的速度与加速度相互垂直空气阻力忽略不计则下列说法中正确的是 coloring