2018-2022学年英语周报高考外研4答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

1x -(2m+M)Ir(1分)解得小物体A、B的相对位移之和,即小车C的最小长度s=A+5B=48m1分(2)1.05后小物体A继续向右减速滑行,小车C与小物体B向右加速运动,最终达到共同速度x(1分)在该过程中,对小物体A运用动量定理得一∫△n△v(1分)解得M=0,8s即系统在【=1.8s时达到共同速度,此后一起做匀速运动(1分)在1.0~3.08时间内的v-t图象如图所示w(m-s)14.【解析】(1)由图可知,在第1.0s内,小物体A、B的加速度大小相等,为a=2m/s2,小物体A、B所受的摩擦力均为了=ma=2N方向相反,因此小车C在第1s内静止不动(1分)设系统最终的速度为v,对系统由动量守恒定律得mUA+mUn=(2m+MD(1分)代入数据解得v=0.4m/s,方向向右对系统由能量守恒定律得f(5+5B)=m+

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