2019～2022英语周报八年级上册34期答案

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17.答案:(1)2m/s(2解析:(1)物体1下滑过程中,对于物体1与滑块组成的系统由机城能守恒和水平方向动量中恒可得:m1gR=m1可十方m可0m,D,-m,D解得:1=2m/s(2)因瑾前物体2所受合外力为0,故碰前物体2一直保持静止,故v=0由动量守恒有:mD1=(m三个物体共速时,弹簧弹性势能最大,由动量守恒和能量守恒可知(m1+m:),(mITtm2)m)m,可+m2+m,)4+解得:E=1.51

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