如图所示一根轻弹簧竖直固定在水平地面上在弹簧的正上 方有一个物块物块从高处自由下落到弹簧上端o将弹簧压 缩.弹簧被压缩了时物块的速度 Template




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tomski如图所示一根轻弹簧竖直固定在水平地面上在弹簧的正上 方有一个物块物块从高处自由下落到弹簧上端o将弹簧压 缩.弹簧被压缩了时物块的速度 coloring