如图所示ab两质量相等的长方体木块放在光�的水平面上一颗子弹以水平速度v先后穿过a和b子弹穿过b后的速度变为2v5 子弹在a和b内 Template




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tomski如图所示ab两质量相等的长方体木块放在光�的水平面上一颗子弹以水平速度v先后穿过a和b子弹穿过b后的速度变为2v5 子弹在a和b内 coloring