如图小球从高处下落到竖直放置的轻弹簧上从接触弹簧开始计时到弹簧压缩到最短的过程中下列叙述正确的是a小球的速度一直减�b小球的加速度先 Template




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tomski如图小球从高处下落到竖直放置的轻弹簧上从接触弹簧开始计时到弹簧压缩到最短的过程中下列叙述正确的是a小球的速度一直减�b小球的加速度先 coloring