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Old 08-03-2008, 09:08 PM   #1
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Need some mathematical help

So I'm trying to figure out the speed a vehicle is traveling. The only information I can give is that I weighed about 155 at the time and was knocked approximately 17-22 feet. I was hit by an SUV that weighs around 4500 lbs.
Just curious if there's a formula to find out it's speed right before impact.
thanks for any help.
-Rob
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Old 08-03-2008, 09:17 PM   #2
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Re: Need some mathematical help

you probably could if there was no resistance between you and the distance traveled after impact

an suv would have to be going alot faster to hit you and throw you that far if you had a seat belt on or if it threw you through a window first

hypothetically though, if you were at a stop sign, no seat belt and the windows down. if you were t-boned by this 4500lb suv and it threw you straight out the drivers side window about 20ft from the car, i would say that suv was going about 30-40 mph
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Old 08-03-2008, 09:29 PM   #3
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Re: Need some mathematical help

oh sorry, forgot to add that I was on a moped making a turn and not even really going more then 1 mph when I was hit from the side/behind. speed limit in the area was 50MPH so just curious how fast the driver was really going. I'll have to look up the exact vehicles weight.

It's been about 14 months since the accident and I posted the gruesome pics about a year ago. Still fighting to get compensated...
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Old 08-03-2008, 09:36 PM   #4
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Re: Need some mathematical help

Should be pretty easy if you neglect some stuff. If no one answers by tomorrow afternoon, I'll try to solve it if I have some free time at work.
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Old 08-03-2008, 09:36 PM   #5
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Re: Need some mathematical help

4500lbs of force hit you (155lbs) and threw you airborne ~20ft..................i would say more like 25-30mph
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Old 08-03-2008, 09:42 PM   #6
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Re: Need some mathematical help

take my answer with a grain of salt though, the formula you can derive from this involves calculus, which is not one of my strong subjects
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Old 08-04-2008, 07:58 AM   #7
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Re: Need some mathematical help

without exact weight and travel speed of the suv its impossible to determine how hard you were hit, but you can get close. You also have to know the impact direction, skimmed, head on, etc... or you wont be accurate either.
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Old 08-04-2008, 08:17 AM   #8
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Re: Need some mathematical help

this is physics... just to clarify

A formula for an inelastic collision would be what you're looking for. And most of those formulas are UGLY.
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Old 08-04-2008, 10:56 AM   #9
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Re: Need some mathematical help

Quote:
Originally Posted by SpectorV View Post
without exact weight and travel speed of the suv its impossible to determine how hard you were hit, but you can get close. You also have to know the impact direction, skimmed, head on, etc... or you wont be accurate either.
I'm trying to find out the speed it was traveling. Sorry I probably didn't word it correct because it sounds ok in my head when I'm typing. lol...
Well I actually can't remember how I hit the ground but somehow I did and I landed straight ahead in the car lane.
The moped went just as far but off to the side of the road and into the ditch.
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Old 08-04-2008, 11:13 AM   #10
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Re: Need some mathematical help

Well I found the weight in Kg. It's 2265 kg curb weight plus the lady probably weighed around 140 lbs.
I guess there's just too many variables. From the dammage done I know for sure she was going at a minimum of 40 mph.
here's a pic of it, except it had the big chrome push bars on the front.
Mitsubishi Shogun Review and no this isn't spam. just had trouble finding UK websites with the car...
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