4.叠放在一起的ab两物体在水平力f的作用下沿水平面以某一速度匀速运动现突然将作用在b上的力f改为作用在a上并保持大小和方�不变如图 Template




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tomski4.叠放在一起的ab两物体在水平力f的作用下沿水平面以某一速度匀速运动现突然将作用在b上的力f改为作用在a上并保持大小和方�不变如图 coloring