![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
一只弹簧原长10cm,挂10N砝码时弹簧长度变为12cm,如再挂20N砝码时,弹簧的长度变为()
A.16cm
B.6cm
C.14cm
D.18cm
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
C、14cm
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.16cm
B.6cm
C.14cm
D.18cm
C、14cm
弹簧的伸长与下面所挂砝码的重量成正比,已知弹簧挂209重的砝码时长度是l2cm,挂
359重的砝码时长度是l5cm,写出弹簧长度y(cm)与砝码重x(g)的函数关系式,并求弹簧
不挂砝码时的长度.
A.18N
B.10N
C.12N
D.16N
A.4N
B.8N
C.10N
D.12N