题目:
完形填空。 | ||||
Dear friend, I am 1 English girl. 2 name is Lucy King. I am twelve. I 3 two brothers. 4 is Tom, the other is Mike. My brothers and I 5 all at school. We go to school from Monday to Friday. We 6 any classes on weekends (周末). I like reading (阅读). Reading is very 7 . But 8 brothers like playing football and basketball. We all like watching 9 . Do you often watch them? Let's 10 friends. Please write (写信) soon. Yours, Lucy King | ||||
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答案:
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两球碰撞过程中,系统所受合外力为零,系统动量守恒,由动量守恒定律得:mv0=mvA+mvB…①碰撞为完全弹性碰撞,系统机械能守恒,由机械能守恒定律可得:12mv02=12mvA2+12mvB2…②联立①②解得:vA=0,vB=v0,设A球...