14.如图所示用细绳拉着小球a�上做加速运动小球ab间用弹簧相连二球的质量分别为m和2m加速度的大小为a若拉力f突然撤去则ab Template




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tomski14.如图所示用细绳拉着小球a�上做加速运动小球ab间用弹簧相连二球的质量分别为m和2m加速度的大小为a若拉力f突然撤去则ab coloring