如图一个小皮球以初速度v沿着粗糙的路面从a点�d点运动其中b和d两点在同一水平高度.则下列说法中正确的是 A小皮球加速下�是由于 Template




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tomski如图一个小皮球以初速度v沿着粗糙的路面从a点�d点运动其中b和d两点在同一水平高度.则下列说法中正确的是 a小皮球加速下�是由于 coloring