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Hard2Get
Advanced Member
United Kingdom
12,837 posts
Joined: Jun, 2001
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 Posted - 2010/03/06 : 02:26:57
Your not a retard. None of it even means anything to me whatsoever. My god maths is so shit lol.
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8D
Advanced Member
Canada
820 posts
Joined: Oct, 2009
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Posted - 2010/03/06 : 02:35:42
I know it's ****ing stupid!
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Citrick
Average Member
Ireland
234 posts
Joined: Jan, 2009
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Posted - 2010/03/06 : 15:23:40
quote:
Originally posted by Lorenzo.Tweakn:
quote:
Originally posted by 8D:
Thank you! :D
now I need help with math:
the relation between a vehicle's stopping distance (d) in metres and the vehicle's speed (s) in kilometres per hour is modelled by the formula:
d=0.0056s(little 2) + 0.14s
a) find the vehicle's stopping distance when it's speed in 30kph
I am retarded and can't figure this out, the answer is in my book but I have to show that I can do it on paper
also this is grade 11 math in canada :)
are u ****ing serious?
I dont know what "little 2" means? But just sub in s?
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8D
Advanced Member
Canada
820 posts
Joined: Oct, 2009
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Posted - 2010/03/07 : 01:44:11
quote:
Originally posted by Citrick:
quote:
Originally posted by Lorenzo.Tweakn:
quote:
Originally posted by 8D:
Thank you! :D
now I need help with math:
the relation between a vehicle's stopping distance (d) in metres and the vehicle's speed (s) in kilometres per hour is modelled by the formula:
d=0.0056s(little 2) + 0.14s
a) find the vehicle's stopping distance when it's speed in 30kph
I am retarded and can't figure this out, the answer is in my book but I have to show that I can do it on paper
also this is grade 11 math in canada :)
are u ****ing serious?
I dont know what "little 2" means? But just sub in s?
little two is like "to the power of 2" or whatever
I still can't figure this out
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DarrenJ
Advanced Member
Australia
2,626 posts
Joined: Jul, 2003
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Posted - 2010/03/07 : 02:39:20
Its 70 meters
s = 100
stolen from yahoo answers:
you need to be able to stop within 70m, so that is the value for d
you can then plug 70m into the equation to solve for speed
if it makes it easier, "s" is just a variable that you are going to solve for. Think of it like an "x" in any other equation. "m" is not a variable, it is a unit.
70m = 0.0056s^2 + 0.14s
0= 0.0056s^2 + 0.14s - 70m
use the quadratic equation to solve:
ax^2 +bx +c
so .0056 = a
.14 = b
and -70m = c
(-b +- sqrt(b^2 -4ac)) / 2a
so this tells us what values "s" will equal when we solve for it.
these values come out to be
s = 100
s = -125
since we can't have negative speed unless we're going backward, we reject -125 as an answer and say that if your speed is 100 km/hour, you can stop in 70 m
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☻hardcore
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Edited by - DarrenJ on 2010/03/07 02:46:28 |
Hard2Get
Advanced Member
United Kingdom
12,837 posts
Joined: Jun, 2001
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Posted - 2010/03/07 : 15:05:25
My head hurts. I've never even seen anything like that before let alone understand it. What the hell are they expecting you to learn? You need to be Einstein to understand that shit.
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Edited by - Hard2Get on 2010/03/07 15:07:07 |
DarrenJ
Advanced Member
Australia
2,626 posts
Joined: Jul, 2003
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Posted - 2010/03/07 : 16:15:14
well remember you got to expand it then simplify in maths to prove you understand it, it proves ur not using a calculator O.o
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☻hardcore
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latininxtc
Advanced Member
United States
7,307 posts
Joined: Feb, 2006
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Posted - 2010/03/07 : 16:20:19
quote:
Originally posted by Hard2Get:
My head hurts. I've never even seen anything like that before let alone understand it. What the hell are they expecting you to learn? You need to be Einstein to understand that shit.
nah not really it's like 2nd level algebra. or it's basyc physics math. i recognized it but was too lazy to make an effort to help 
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8D
Advanced Member
Canada
820 posts
Joined: Oct, 2009
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Posted - 2010/03/08 : 18:18:39
thanks for the help Darren but I still don't understand this for shit
apparently the answer is 9.24m
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