从高为h的平台上同时水平抛出两个物体a和b已知mb=2ma抛出时的速度va=2vb不计空气阻力它们从抛出到落地时的动量增量大小分别是 Template




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tomski从高为h的平台上同时水平抛出两个物体a和b已知mb=2ma抛出时的速度va=2vb不计空气阻力它们从抛出到落地时的动量增量大小分别是 coloring