| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Specify the value of the force constant k of the spring.
Tip 1: The oscillation time of a spring can be determined from the equation $T=2\pi\sqrt{\frac{m}{k}}$
Tip 2: Place the observation values in the $(T^2,m)$ –coordinate system.
Tip 2: Place the observation values in the $(T^2,m)$ –coordinate system.
Answer: $12\ N/m$