Hi Everyone. I have a question for you all that is most definitely not homework - Its over 20 years since I was at school and sadly I cant remember very much of what our maths teacher told us.... hence the reason I'm here! I work for a company that does off-road vehicle modifications, these modifications add to the weight meaning that the braking distance is increased. For many years we have been testing the vehicles using a brake tester that reports the deceleration force in "Negative g" However we now have a customer who wants us to report the stopping distance - Easy if you can measure it which is what we've been doing. However, I cant help thinking there must be a relationship between the vehicle's weight, starting speed, the "negative g" deceleration and the stopping distance. So, if the vehicle weighing 3900kg is travelling at 40km/h and we achieve a deceleration force of 0.9g, what will the stopping distance be? How can I calculate it for other vehicle weights? Answers in metric please as I'm in Australia! I'm not an engineer and I dont have many qualifications so please excuse the lack of an attempted solution.