A maintenance vehicle of mass 1500 kg is tested on a closed road at two different initial speeds. In both tests, the driver's reaction time is 0.50 s and the resultant braking force is constant at 9000 N.
| Test | Initial speed |
|---|---|
| 1 | 12 m/s |
| 2 | 18 m/s |
Calculate the total stopping distance for test 1.
Calculate the total stopping distance for test 2.
Explain why the thinking distance and the braking distance increase by different factors between test 1 and test 2.