题干

 小明在做用一根弹簧制作弹簧测力计的实验时,在弹簧的下端用不同的力拉弹簧,对应的弹簧的长度也不同.具体数据如下:

拉力(N)

0

1

2

3

4

5

弹簧长度(cm)

3

5

7

9

11

13

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