| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Investigate the oscillation time of a spring effected by different mass. Show the results graphically and determine from the graph of the mass when the oscillation time of the spring is 1 s.
Answer: 305 g - 320 g