Mechanics maths problem, please help me

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19 Replies - 2951 Views - Last Post: 08 December 2012 - 09:39 AM

#16 strawhat89  Icon User is offline

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Re: Mechanics maths problem, please help me

Posted 06 December 2012 - 11:03 PM

Yes sir. I read it in an old book I found hidden in the town's library.
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#17 jon.kiparsky  Icon User is offline

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Re: Mechanics maths problem, please help me

Posted 06 December 2012 - 11:05 PM

A book? I saw it painted on the wall of a cave in France.
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#18 raghav.naganathan  Icon User is offline

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Re: Mechanics maths problem, please help me

Posted 06 December 2012 - 11:26 PM

Well, I don't know about you guys...but I got that as an SMS on my mobile.
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#19 JorgenG  Icon User is offline

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Re: Mechanics maths problem, please help me

Posted 07 December 2012 - 05:45 AM

Your visual is of great aid, but you are using it wrong!

So you know that A + B = 100

Remember that A and B is distance here.

What is the distance after the runner stopped accelerating? S = V * T
This translates into: B = v * 8.6

What is the distance during acceleration? S = 2(u + v) / t
This translates into: A = 2 (8,8 + v ) / 2 = 8,8 + v

Putting it all together:
100 = 8,8 + v + v*8,6

=> 91,2 = 9,6v
=> v = 91,2 / 9,6 = 9,5 m/s
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#20 Coding in the name of  Icon User is offline

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Re: Mechanics maths problem, please help me

Posted 08 December 2012 - 09:39 AM

Thanks JorgenG! I understand it now.
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