11.如图所示一根轻弹簧下端固定竖立在水平面上其正上方a位置有一只小球小球从静止开始下落在b位置接触弹簧的上端在c位置小球所受弹力 Template




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tomski11.如图所示一根轻弹簧下端固定竖立在水平面上其正上方a位置有一只小球小球从静止开始下落在b位置接触弹簧的上端在c位置小球所受弹力 coloring