某学生在体育场上抛出铅球其运动轨迹如图所示.已知在b点时的速度与加速度相互垂直则下列说法中正确的是 A.d点的速率比c点的速率大b.d Template




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tomski某学生在体育场上抛出铅球其运动轨迹如图所示.已知在b点时的速度与加速度相互垂直则下列说法中正确的是 a.d点的速率比c点的速率大b.d coloring