使用打点计时器研究匀变速直线运动的实验中，（1）实验室用的电磁打点计时器，使用的是
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（1）电磁打点计时器和电火花计时器都是使用交流电源的计时仪器．（2）根据△x=aT2得：a=
| s2?s1 |
| T2 |
| 0.0375?0.0265 |
| 0.01 |
时间中点的瞬时速度等于该过程的平均速度，则B点的速度vB=
| s2+s1 |
| 2T |
| 0.0375+0.0265 |
| 0.2 |
故答案为：（1）交流；（2）1.1；0.32．
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