Author Topic: HELLP ME ON THIS QUESTION OF MATHS PLSSSSS  (Read 1088 times)

Offline DEGO

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HELLP ME ON THIS QUESTION OF MATHS PLSSSSS
« on: April 14, 2010, 08:16:12 pm »
A PARTICLE MOVES ALONG A LINE
for> the distance of particle from O at time T is X meters   WHERE
x=20/t

find an expression for the acceleration of the particle
 i cant understand how its answered in MS
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Offline astarmathsandphysics

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Re: HELLP ME ON THIS QUESTION OF MATHS PLSSSSS
« Reply #1 on: April 14, 2010, 08:20:04 pm »
Write it as x=20*t^{-1} and diffentiatte
v=\frac {dx}{dt} =-1*20*t^{-2} =-20*t^{-2}
a=\frac {d^2 x}{dt^2} =-2*-20*t^{-2} =40*t^{-3}
« Last Edit: April 14, 2010, 09:08:33 pm by astarmathsandphysics »

Offline DEGO

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Re: HELLP ME ON THIS QUESTION OF MATHS PLSSSSS
« Reply #2 on: April 14, 2010, 08:23:59 pm »
how did the 20 change to  - 20  XD (some times i get mind block)
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holtadit

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Re: HELLP ME ON THIS QUESTION OF MATHS PLSSSSS
« Reply #3 on: April 14, 2010, 08:29:10 pm »
Dude this isnt IGCSE man !!

This is like A-Level

Offline DEGO

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Re: HELLP ME ON THIS QUESTION OF MATHS PLSSSSS
« Reply #4 on: April 14, 2010, 08:42:04 pm »
i got it THX  (the first hard question i meat in edexel maths)
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Amr Fouad

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Re: HELLP ME ON THIS QUESTION OF MATHS PLSSSSS
« Reply #5 on: April 14, 2010, 08:56:24 pm »
this is not IGCSE..it's A-L

Offline DEGO

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Re: HELLP ME ON THIS QUESTION OF MATHS PLSSSSS
« Reply #6 on: April 14, 2010, 09:07:31 pm »
i solved it in olvl maths edexel
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Offline astarmathsandphysics

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Re: HELLP ME ON THIS QUESTION OF MATHS PLSSSSS
« Reply #7 on: April 14, 2010, 09:09:38 pm »
I edited my post above
When you differentiate Multiply by the power then take 1 from the power

Offline halosh92

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Re: HELLP ME ON THIS QUESTION OF MATHS PLSSSSS
« Reply #8 on: April 14, 2010, 09:33:00 pm »
A PARTICLE MOVES ALONG A LINE
for> the distance of particle from O at time T is X meters   WHERE
x=20/t

find an expression for the acceleration of the particle
 i cant understand how its answered in MS
is this AS or Alevel which paper is it from?
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Offline DEGO

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Re: HELLP ME ON THIS QUESTION OF MATHS PLSSSSS
« Reply #9 on: April 15, 2010, 02:53:16 pm »
i found it paper 4h edexel i am olvl  idk if its Al cambridge
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