在下列给出的器材中,选出探究小车速度随时间变化的规律的实验

 在下列给出的器材中,选出探究小车速度随时间变化的规律的实验中所需的器材填在横线上(填编号).①打点计时器 ②天平 ③低压交流电源 ④低压直流电源⑤细绳和纸带⑥钩码和小车 ⑦秒表 ⑧一端有滑轮的长木板 ⑨刻度尺

选出器材是                                             .

 

答案

 135689 

 

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