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某同学设计了一个打点计时器验证动量守恒定律的实验:在小车A的前端沾有橡皮泥.推动小车A使之做匀速运动.然后与原来静止在前方的小车B相碰并结合成一体,继续匀速运动.他设计的具体装置如图甲所示,在小车A后面连着纸带,电磁打点计时器电源频率为50Hz,长木板下垫着小木片用以平衡摩擦力.(1)若得到打点纸带如下图乙所示,并测得各计数点间距离标在图上,A为运动起始的第一点,则应选______ 段来计算A和B碰后的共同速度.(填AB、BC、CD、DE)(2)已测得小车A的质量为0.40kg,小车B的质量为0.20kg,由以上测量结果可得:碰前总动量为______ kg•m/s,碰后总动量为______kg•m/s.
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