A student investigates how the extension of a stiff metal spring changes as force is applied. The experimental setup is shown in Figure 1.
The student's measurements are recorded in the table below:
| Force (N) | Extension (cm) |
|---|---|
| 1.0 | 1.5 |
| 2.0 | 3.0 |
| 3.0 | 4.5 |
| 4.0 | 6.0 |
| 5.0 | 7.5 |
| 6.0 | 9.0 |
Using a grid where the horizontal x-axis represents Force (N) from 0 to 6.0 and the vertical y-axis represents Extension (cm) from 0 to 10.0, plot the points and draw a line of best fit.