2.BD【解析】物块到最低点时,弹簧压缩的距离最大界簧的压缩量为(3-1)L,所以弹簧中的纸大弹力为(3-1)kL,A错误;物块、小球和弹簧组成的系统总机械能守恒,当物块到最低点时,弹簧压量最大,弹簧的弹性势能最大,物块与小球组成的系统减小的机械能最多,由几向关系可知物块F降了(2-),所以弹簧弹性势能最多增加了E,(22)4kL,小球和物块组成的系统机械能最多减小√3-12MgL,B正确;释放间,物块向下加速,小球向中间加速,细线上瞬间产生弹力,物块的加速度小于g,C错误;由于物块向下加速后向下减速,物块的加速度先向下后向上因此物块到最低点时,细线中拉力合力取最大值,对小球根据牛顿第二定律有(3一1)AL一 FI. cos60°ma,合力的最大值为2Fmin60°,为(6-2/)k23m,D正确,

改错改错I'm quite health. I very rarely get colds, although, unusually for me, I had a badly cold and ahealthybadBit of a fever last week But that's because I was stupid enough to playing football in the rain. Idon'toften get things like flu, neither. Last winter almost all my classmates get flu, but I didnt. Ieiththink i dont get these things because of i take a lot of exercise and is very fit. Two years before Ibroke my arm playing football. An injury was quite painful and I couldn't move my arma aTheMonth i hated that

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