题目

AB为一弹性绳,设法在绳上传播一个脉冲的波,如图所示,当波从A向B传播时,绳上质点开始振动的速度方向是                                                                                          ,若当波从B向A传播时,绳上质点开始振动的速度方向是                                                                                                                                                                                                                                                                                                                                                                           答案:垂直AB向下;垂直AB向上
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