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| 30 Sep 2015 08:04 PM |
so today we were doping acceleration u know delta v/t
so we have this problem
a truck hits the break and goes from 45 m/s to 0 m/s in 5 seconds
a = (-) 9m/s^2
then the question says how fast is car after 1 s 2s 3s 4s 5s
she says the answer are as follows; 1 second = -9m/s 2 second = -18 m/s 3 second = -27 m/s 4 second = -36 m/s 5 second = -45 m/s |
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| 30 Sep 2015 08:06 PM |
you guys say a = 9m/s^2?
we round to 10
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| 30 Sep 2015 08:06 PM |
oh ignore that comment lol, I thought we were talking about the general acceleration due to gravity
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| 30 Sep 2015 08:09 PM |
is that the right answer
its uniformaly decelarating
so wouldnt it be
after 1 second its going 36m/s no -9m/s |
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| 30 Sep 2015 08:10 PM |
after 1 second velocity = 36m/s
2 seconds velocity = 27m/s
etc.
Dunno what she is doing
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| 30 Sep 2015 08:10 PM |
| i bet she has been teaching it wrong for 15 years |
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| 30 Sep 2015 08:11 PM |
technically it is right but that's bad logic |
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supper828
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| Joined: 06 Feb 2010 |
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| 30 Sep 2015 08:19 PM |
uh.....
time to transfer out of that downie brownie school
damn it feels good to be a community member with a slight level of misdemeanor---------------------------------Send me trades; http://web.roblox.com/Trade/TradeWindow.aspx?TradePartnerID=14652018 |
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MrHoard
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| Joined: 13 Dec 2014 |
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| 30 Sep 2015 08:20 PM |
well 45 -9 = 36
45 - 18 = 27
maybe that is wat she meant |
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supper828
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| Joined: 06 Feb 2010 |
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| 30 Sep 2015 08:21 PM |
wait nvm she is actually right
she is teaching it in the sense that its -(x), which is taking away from the original speed
EX; her saying -9, means (x), which is the starting speed, -9, which is 36.
This leads up to 5, which is -45, and (x) - 45, x being 45, results in 0.
damn it feels good to be a community member with a slight level of misdemeanor---------------------------------Send me trades; http://web.roblox.com/Trade/TradeWindow.aspx?TradePartnerID=14652018 |
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| 30 Sep 2015 08:22 PM |
no but she says the answer of the speed IS all negatives
shes not adding 45 m/s to any of the answers |
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| 30 Sep 2015 08:23 PM |
| tell her to draw a picture of that LOL |
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| 30 Sep 2015 08:24 PM |
| Uhmmm I don't see how she's stupid. Looks right to me. |
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| 30 Sep 2015 08:25 PM |
| how can the truck be going -45m/s |
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supper828
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| Joined: 06 Feb 2010 |
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| 30 Sep 2015 08:25 PM |
unless she states that the time after (x) seconds is the net speed, she is right.
damn it feels good to be a community member with a slight level of misdemeanor---------------------------------Send me trades; http://web.roblox.com/Trade/TradeWindow.aspx?TradePartnerID=14652018 |
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| 30 Sep 2015 08:26 PM |
guys its not acceleration ITS SPEED OMG U CANT HAVE A NEGATIVE... |
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| 30 Sep 2015 08:26 PM |
| Actually I can see why you are confused. Your teacher is right but you still need to finish off the problem by plugging in the negatives. So since 1 second the truck slows down 9m/s it would be 45-9=36m/s |
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1pool1
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| 30 Sep 2015 08:26 PM |
:l brain fart
#code print("☾♒Send me trades♒☽") -- ♛➊ⓅⓞⓄⓁ➊♛ |
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| 30 Sep 2015 08:29 PM |
she is right yeah
basically she is saying it like in each second the truck will be slowing down that many m/s
just saying it in a weird way.
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| 30 Sep 2015 08:30 PM |
ur teacher makes it seem like a math class lol
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| 30 Sep 2015 08:32 PM |
those answers r correct lol
also my physics teacher was an imagineer for disney (that's what engineers were called there) and he was one of the engineers who made the tower of terror supposedly |
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| 30 Sep 2015 08:32 PM |
| Ice....if you've taken physics you know there's a lot of math involved. |
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| 30 Sep 2015 08:34 PM |
ap physics
duh its complicated math + logic not just math |
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| 30 Sep 2015 08:37 PM |
| screw physics when you have the internet |
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| 30 Sep 2015 08:38 PM |
omg ice what ap physics are u taking
im taking ap physics a mechanical based, or are you in a specific field?
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