| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Define the average force on the ball during the acceleration. a) By means of the basic law mechanics: ∑ F̅ = ma̅. b) Through the power impulse: F∆t = m∆v
Answer: 0,08 N