Re: [Math4u] Re: mathematicaly challenged

Here is an idea. I am assuming that what you are after is breaking distance, so graph distance vs time. Drawing a graph will help you visulaise what you are trying to calculate. Once you have the graph then work out the quadratic equiation.

Ray is right, you do need to know your deceleration value.

Well, to a point. In a general sense you can come up with an equation, but you will not be able to calulate the stopping distance until you know this missing value, or the length of time that it takes for the vehicle to come to a halt, or the distance.

 

On 10/27/07, RayKornele <krazykyngekorny@yahoo.com> wrote:

--- In Math4u@yahoogroups.com, "caglepieniazekgladys"
<caglepieniazekgladys@...> wrote:
>
> I am trying to complete the following homework assisnment.
> find the quadratic function based on the stopping distance for 55
> mph and 65 mph and the fact that at 0 mph the stopping distance is 0
> feet.
>
> use that equation to predict the stopping distances for 55 mph and
> 65 mph.
>
> Thanks
> Elasha
>

You need to know thw negative acceleration constant, called
deceleration constant. Otherwise, you don't know how quickly the
energy of motion is being dissipated.

When dealing with gravitation, that constant is always nearly the
same. But, with a car, it depends on the quality of the brakes, and
how hard they are applied.
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