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jamesrwrightiii
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Help With This Velocity Problem 09 Jul 2006, 21:39
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Please help with this problem..thanks!
It seemed simple, but I kept on getting wrong answer
Probably because I am so tired



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ps_dahiya
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Help With This Velocity Problem 09 Jul 2006, 21:45
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A

Substitute the value of d in second equation.

t = (2*3*v^2)/(20*v) = 3v/10

6 = 3v/10
v = 20
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MA
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Help With This Velocity Problem 09 Jul 2006, 21:55
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t =2d/v
6 = 2d/v
d = 3v


d = 3v^2/20
3v = 3v^2/20
v = 20..
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jamesrwrightiii
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Help With This Velocity Problem 09 Jul 2006, 21:57
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ps_dahiya
A

Substitute the value of d in second equation.

t = (2*3*v^2)/(20*v) = 3v/10

6 = 3v/10
v = 20
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I agree. That is what I had...the stupid Answer Key has errors on it and said the answer was "E"

It is GMAT Plus material.
I think I am going to scrap this particular book as the answer key has had 3 errors in a row on it.
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ps_dahiya
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Help With This Velocity Problem 09 Jul 2006, 22:05
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jamesrwrightiii
ps_dahiya
A

Substitute the value of d in second equation.

t = (2*3*v^2)/(20*v) = 3v/10

6 = 3v/10
v = 20

I agree. That is what I had...the stupid Answer Key has errors on it and said the answer was "E"

It is GMAT Plus material.
I think I am going to scrap this particular book as the answer key has had 3 errors in a row on it.
Show more


If this is the case, burn that material :rocket :rocket
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shahsac
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Help With This Velocity Problem 10 Jul 2006, 07:18
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This is a weird questions as the units don't match in the equations provided

It says units for
d=m
v=m/s
t=s

but then it says d=3v^2/20???????????
if we compare the units on both side

LHS = d = meters
RHS = 3v^2/20 = (m/s)^2

and same is the case with the other equation.......

Am I left field here???????
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v1rok
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Help With This Velocity Problem 10 Jul 2006, 09:21
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That is an interesting observation, but I think you are digging too deep here. I don't expect real GMAT test writers would go in such a trouble in order to deceive people, especially since Physics is not supposed to be tested on GMAT
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haas_mba07
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Help With This Velocity Problem 10 Jul 2006, 09:41
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(A) 20.


Given t = 2d/v and d = 3v^2/20

Replacing d in first equation :

t = 2x3v^2/v x 20 = 6v/20

or 20 x t/6 =v

Replacing t = 6, v = 20.

Answer : (A) 20.



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Hi there,
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