英语周报七年级新目标2022-2023CSX答案

只“许蚱改多从第11处起)不计分more elect:te andqbower that can drive people earn active and happily. It also makes leaningentI really appreciate the opinion. I had been fond of English since I was a little boy. And Got in-terested in foreign cuit ures and custorhayn particular to meet my curosityod Fng.n…--,ins to English songs and watched English films every dav. a,i o: thnat of my daiy life. As the result. I always did very well in English xmsIn a word. interesting is the key to success. Anyone who are interested in somen s现e

14.(15分【解析】(1)由题可知,设小球滚到斜槽末端时,A与C的速度大小分别为vA、A与C系统水平方向动量守恒,取水平向右为正方向,则mU1-2mx=0(1分)A与C系统的机械能守恒,则mgR=m+×2mv………(1分)小球滚动到斜槽末端时斜槽的动能E=×2m(1分)联立解得E=3mgR………(1分)(2)①小球滚到木板上后,小球与木板的加速度大小分别为a和a2则分

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