如图所示自由下落的小球开始接触竖直放置的弹簧到弹簧被压缩到最短的过程中小球的速度和所受合力的变化情况是 A合力变小速度变小 Template




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tomski如图所示自由下落的小球开始接触竖直放置的弹簧到弹簧被压缩到最短的过程中小球的速度和所受合力的变化情况是 a合力变小速度变小 coloring