Final answer:
Measure the distance the driver covers before hitting the brakes, record the time it takes for the truck to come to a complete stop after hitting the brakes, and calculate the total distance the truck covers to stop.
Step-by-step explanation:
To test the trailer service brakes, you can perform a controlled experiment using a test track. Here's how you can do it:
- Measure the distance the driver covers before hitting the brakes.
- Record the time it takes for the truck to come to a complete stop after hitting the brakes.
- Calculate the total distance the truck covers to stop by adding the initial distance and the distance covered during braking.
This experiment will help you evaluate the effectiveness of the trailer service brakes in terms of distance covered and stopping time.