一轻质弹簧一端固定在竖直墙壁上另一自由端位于o点现用一�块将弹簧的自由端从o点压缩至a点后由静止释放运动到b点停止如图所示.�块自a Template




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tomski一轻质弹簧一端固定在竖直墙壁上另一自由端位于o点现用一�块将弹簧的自由端从o点压缩至a点后由静止释放运动到b点停止如图所示.�块自a coloring