To determine the appropriate titles for each column, let's analyze the given data and what each column represents:
1. Column 1:
- This column contains the entries: 0, 2, 4, 6, 8, 10.
- These entries increase sequentially and are measured in seconds.
- This column represents the time elapsed. Hence, Column 1 should be titled "Time".
2. Column 2:
- This column contains the entries: 5, 10, 15, 20, 25, 30.
- These entries are increasing and denote the speed of the car in a northern direction.
- The speed is measured in units that you would associate with velocity (speed in a specific direction). Hence, Column 2 should be titled "Velocity".
Based on this analysis, the best titles for each column are:
- Column 1 should be titled "Time."
- Column 2 should be titled "Velocity."
Thus, the correct answer is:
Column 1 should be titled "Time," and Column 2 should be titled "Velocity."