A pointer attached to a spring balance points to 21.5 cm on a scale when no weight is suspended from it. When a mass of 165g is hanged from it, it points 38.0 cm.
- Determine its spring constant.
- What would be the extension if two similar springs A and B in (a) above are used as shown below.
![Similar springs](https://www.easyelimu.com/images/form_4_past_papers/Term_3_2021/Mocks_/physics/Similar_springs.JPG)