To determine which cars are either speeding up or slowing down, we need to compare the starting and ending velocities for each car.
1. Car A:
- Starting Velocity: [tex]\(30 \, \text{km/h}\)[/tex]
- Ending Velocity: [tex]\(30 \, \text{km/h}\)[/tex]
- Change in velocity: [tex]\(30 - 30 = 0 \, \text{km/h}\)[/tex]
- Conclusion: Car A is neither speeding up nor slowing down.
2. Car B:
- Starting Velocity: [tex]\(0 \, \text{km/h}\)[/tex]
- Ending Velocity: [tex]\(20 \, \text{km/h}\)[/tex]
- Change in velocity: [tex]\(20 - 0 = 20 \, \text{km/h}\)[/tex]
- Conclusion: Car B is speeding up.
3. Car C:
- Starting Velocity: [tex]\(30 \, \text{km/h}\)[/tex]
- Ending Velocity: [tex]\(0 \, \text{km/h}\)[/tex]
- Change in velocity: [tex]\(0 - 30 = -30 \, \text{km/h}\)[/tex]
- Conclusion: Car C is slowing down.
4. Car D:
- Starting Velocity: [tex]\(0 \, \text{km/h}\)[/tex]
- Ending Velocity: [tex]\(0 \, \text{km/h}\)[/tex]
- Change in velocity: [tex]\(0 - 0 = 0 \, \text{km/h}\)[/tex]
- Conclusion: Car D is neither speeding up nor slowing down.
5. Car E:
- Starting Velocity: [tex]\(20 \, \text{km/h}\)[/tex]
- Ending Velocity: [tex]\(30 \, \text{km/h}\)[/tex]
- Change in velocity: [tex]\(30 - 20 = 10 \, \text{km/h}\)[/tex]
- Conclusion: Car E is speeding up.
From the above analysis, we can conclude that:
- Car B is speeding up.
- Car C is slowing down.
- Car E is speeding up.
Therefore, the cars that are either speeding up or slowing down are: Car B, Car C, and Car E.
