# Thread: Need a formula to calculate the speed variation.

1. ## Need a formula to calculate the speed variation.

Dear All,

I am new to this forum. I am searching a formula to calculate the speed variations. Please forgive me if its a simple question.

A bus moving from a position to a another position, total distance will be 100km. The bus started 50km speed. bus will reach the destination by 5km speed. So the speed slowly decreasing from 50km to 5km.

Now my question is what will be the speed while the bus reaching at 40km distance ?

If this is not a right place to raise this question, pls move this post to right category.

Thanks,
Karthikeyan

2. Originally Posted by karthicvkn
Dear All,

I am new to this forum. I am searching a formula to calculate the speed variations. Please forgive me if its a simple question.

A bus moving from a position to a another position, total distance will be 100km. The bus started 50km speed. bus will reach the destination by 5km speed. So the speed slowly decreasing from 50km to 5km.

Now my question is what will be the speed while the bus reaching at 40km distance ?

If this is not a right place to raise this question, pls move this post to right category.

Thanks,
Karthikeyan
Your question is not well posed. I can find an infinite number of continuous curves that that will fit the two boundary points. I can find a curve that will have any value between 5 and 50 at 40km. The point is we need more information about the change in velocity. Is it Linear? quadratic? something else? Please clarify.

3. Originally Posted by TheEmptySet
Your question is not well posed. I can find an infinite number of continuous curves that that will fit the two boundary points. I can find a curve that will have any value between 5 and 50 at 40km. The point is we need more information about the change in velocity. Is it Linear? quadratic? something else? Please clarify.
Thanks to you,

It will be linear change in velocity, we need to find out value is used to decreasing the speed from 50 to 5.

I need a correlation formula for reducing 50 to 5 with in 100 times.

I got 0.45, if you reduce 0.45 from 50km speed 100 times, you wll get 5 at end.

But the destination 0 to 100 and speed 50 to 5 will change at any instance.

for example we need to calculate 100 to 400km and speed 60 to 2. so what speed we have to reduce to attain 2 ?

Thanks - karthikeyan

4. Another way to explain you..

A = 0(start), B=100(end), C=10 (10 times)

"A" is 0, it can be add or multiple with any number but within 10 times, in 10th time ("c") when you add something to "A" it must be 100, means equal to "B", So the value you add or multiple with "A" must be Linear, Like 1st time "20", 2nd time - "12", 3rd-"7",... 10th-"2" (the value 20,12,7,2 is a example it can be change).

So which formula you will use to calculate the gradual speed decrease?

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### speed variation calculations

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