题型:单选题 题类:常考题 难易度:普通
如图所示,利用滑轮组匀速提升重物,经过10s,重物被提升了3m,则绳子自由端的速度是( )
观察次数 |
1 |
2 |
3 |
4 |
5 |
里程碑示数 |
20km |
30km |
40km |
50km |
60km |
记录时间 |
8h20min05s |
8h35min00s |
8h50min50s |
9h05min20s |
9h20min05s |
试题篮