Qualification > Math

Last question in the mechanics paper!

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hesho21:
Dude u should check this out..

MAF:

--- Quote from: Spy on May 20, 2010, 12:49:34 pm ---the integrated expression is -3375/t + c=225
you know t is 15

so its -225+c=225
c=450

so it asked what is the speed where distance is 315
you do -3375/t+455=315
t=25

then 3375/25^2 which is equal to 5.4

:)

--- End quote ---
erm....mate, this is the formula for the distance it covers after t=15 sec
so when t=15 s=0....and not s=225  :)

[Spy]:
hahahah so whats C?

and anyways i didnt even put C cause i always do this stupid mistake when i integrate! godddddd!!! :@

i hope they only take away part two's marks and not the third one too

MAF:
But the answer is the 5.4 anyway....cos if you put in 0 as s the the constant 'k' comes out as 225....so the same answer....
man, i dont yth i did this but i messed up question 4..:S
i squared the horizontal and vertical components of the vectors given before finding the resultants horizontal and vertical components....:(
how many marks are they gonna cut for this.....it was a mistake in one step i guess... ??? :-[

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