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11.(1)(2)2(32725m6【解析】(1)设三者最后的共同速度为共，取向右为正方向，细绳断开弹簧释放的过程由动量守恒有(mA十mB)6=mAVA十mBVB(3分)B与C碰撞的过程有mBvB=(mB十mc)v供(2分)整个过程三者动量守恒有(mA十mB)=(mA+mB+mc)v共(3分)90(2分)(2)弹簧释放的能量为△E,=m暖+2mi-子(m十mg)话(3分)m解得△E,=是，(2分)(3)只有B与C碰撞过程中机械能有损失，损失的机械能为△E=合mi-子(ma十mc)候(3分)解得△E-器md(2分)

2.请按如下格式在相应位置作答。Several weeks later,Henry had to left the school to join the navy.Before he left,he had found that Maryslowly started opening up to her classmates.He was happy to see the changes but he didn't think too much of it.He hoped that his words could help the girl become more outgoing and confident.However,what made himdisappointed was that he couldn't see more changes from Mary from then on.Several years later,when Henry was walking,a woman asked him whether he remembered her.In front ofhim was a young lady,who looked sunny and confident.When he was reminded that she was a student in themiddle school where he worked,Henry thought of her name.Mary told Henry that she had graduated from theuniversity and was serving in the navy,too.It was Henry's small act of encouragement in the class years ago thatcontinued to have a big impact on Mary.Henry felt proud that he had done something good.