同理                                                                          ⑥

                                                                    ⑤

                                                                            ④

（2）由于液滴从B板边缘飞出，利用平抛规律有：          ③

由①②得

由于平衡                                                               ②

24．（1）   ∴                                    ①

二阶段     ∴   

23．一阶段    ∴a=2m/s²   ∴   v=at=4m/s

22．（1）AC   （2）1.5 m/s，2 m/s²；1.2 W