如图所示轻绳一端固定于o点另一端系一质量为m的物块a.现用水平力f1拉住绳子上一点p使物块a从图中实线位置缓慢下降到虚线位置.在这一过程 Template




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tomski如图所示轻绳一端固定于o点另一端系一质量为m的物块a.现用水平力f1拉住绳子上一点p使物块a从图中实线位置缓慢下降到虚线位置.在这一过程 coloring