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# After Kerry jumped directly upward from level ground her feet returned

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Math Expert
Joined: 02 Sep 2009
Posts: 48074
After Kerry jumped directly upward from level ground her feet returned  [#permalink]

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09 May 2017, 03:01
00:00

Difficulty:

65% (hard)

Question Stats:

55% (00:40) correct 45% (01:18) wrong based on 27 sessions

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After Kerry jumped directly upward from level ground her feet returned to the ground S seconds later. If Kerry's feet reached a maximum height of 1.44*S^2 meters above the ground on her jump, is S > 1?

(1) Kerry took less than 1 second to descend.
(2) Kerry's feet reached a maximum height of 1 meter above the ground.

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Re: After Kerry jumped directly upward from level ground her feet returned  [#permalink]

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09 May 2017, 12:07
stat1 : since s is less than 1... it will be in decimals...
1.44 *s^2 will be less than when s = 0.2
1.44 * s^2 will grater than 1 when s =0.3.. not suff

stat2: maximum height is 1m.. when height is 1 m... s= sqrt(1/1.44) = less than 1... hence s will be always less than 1..suff
ans B
Senior Manager
Joined: 13 Oct 2016
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GMAT 1: 600 Q44 V28
Re: After Kerry jumped directly upward from level ground her feet returned  [#permalink]

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09 May 2017, 12:54
1
Consider statement A :
Kerry took less than 1 second to descend.

The question is asking is S<1 and it is mentioned that "After Kerry jumped directly upward from level ground her feet returned to the ground S seconds later".

Since S as mentioned is the time taken to descend.

Therefore Statement A is sufficient.

Consider Statement B :

Kerry's feet reached a maximum height of 1 meter above the ground.

Maximum Height => 1.44*S^2 =1

S^2 = 1/1.44

From the above equation we know that the value of S<1

Statement B is sufficient.

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Re: After Kerry jumped directly upward from level ground her feet returned  [#permalink]

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16 May 2017, 03:10

statement 1 ) No information about the time of ascending can be deducted
Senior Manager
Joined: 13 Oct 2016
Posts: 293
GMAT 1: 600 Q44 V28
Re: After Kerry jumped directly upward from level ground her feet returned  [#permalink]

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19 May 2017, 06:31
Kritesh wrote:
Consider statement A :
Kerry took less than 1 second to descend.

The question is asking is S 1.44*S^2 =1

S^2 = 1/1.44

From the above equation we know that the value of S<1

Statement B is sufficient.

_____________________________________________________

Hi Bunuel ,

Could you please explain that why the answer is B and not D ?

Warm Regards,
Kritesh Singh

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: After Kerry jumped directly upward from level ground her feet returned &nbs [#permalink] 19 May 2017, 06:31
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