- Seconds is used to meausre a short amount of time
- A toy car rolling down a hill is a short process
- Hence, seconds should be used to measure the time of a toy car rolling down a hill

Therefore, seconds should be used to measure the time of a toy car rolling down a hill
Students measure the time for toy cars of different masses to roll down a hill. Which of the following units should the students use to measure time?
- Seconds is used to meausre a short amount of time 
- A toy car rolling down a hill is a short process