7.如图所示一质量为m的直角劈b放在水平面上在劈的斜面上放一质量为m的物体a用一沿斜面�上的力f作用于a上使其沿斜面匀速上�在a上� Template




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tomski7.如图所示一质量为m的直角劈b放在水平面上在劈的斜面上放一质量为m的物体a用一沿斜面�上的力f作用于a上使其沿斜面匀速上�在a上� coloring