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On planet K, there is essentially no atmosphere, so objects in freefal

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Magoosh GMAT Instructor
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On planet K, there is essentially no atmosphere, so objects in freefal [#permalink]

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On planet K, there is essentially no atmosphere, so objects in freefall experience no air friction. At time t = 0, an object released from rest accelerates downward at a uniform rate: its downward speed uniformly increases. At time t = 2 second, the object has fallen a distance D in meters from its original height. At time t = 5 second, the object is 75 meters below its original height, and is moving at a downward speed of v in meters per second.

In the table below, select values of D, the distance below the initial height at t = 2 seconds, and v, the downward speed at t = 5 seconds, that are consistent with the information provided. Make only two selections, one in each column.

Attachment:
freefall on planet K.png
freefall on planet K.png [ 1.77 KiB | Viewed 1060 times ]


This is a challenging GMAT IR Two-Part Analysis question. For a set of practice questions, see:
GMAT Integrated Reasoning: Two-Part Analysis Practice Questions

Mike :-)

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[Reveal] Spoiler:
D = 12, v = 30

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Re: On planet K, there is essentially no atmosphere, so objects in freefal [#permalink]

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New post 14 Oct 2016, 15:10
Hi mikemcgarry,

t=5 distance is 75
75/5 = 15 meters per second.
But we don't have that in option. is it because "accelerates downward at a uniform rate" ?
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Magoosh GMAT Instructor
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Re: On planet K, there is essentially no atmosphere, so objects in freefal [#permalink]

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New post 14 Oct 2016, 15:58
Shrivathsan wrote:
Hi mikemcgarry,

t=5 distance is 75
75/5 = 15 meters per second.
But we don't have that in option. is it because "accelerates downward at a uniform rate" ?

Dear Shrivathsan,

I'm happy to respond. :-)

When you divide total distance by total time, that's average velocity over the entire five second interval. You have 100% correctly calculated the average velocity, but unfortunately, that's not the "v" for which the question was asking. You perfectly calculated the answer for a question that was not asked.

Does this make sense?

Mike :-)
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Re: On planet K, there is essentially no atmosphere, so objects in freefal [#permalink]

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New post 18 Oct 2016, 03:03
D = 30
V = 75

Kudos [?]: 5 [0], given: 2

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Re: On planet K, there is essentially no atmosphere, so objects in freefal [#permalink]

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New post 19 Oct 2016, 06:39
hi Mike,
I did not get the solution. could u help?

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Magoosh GMAT Instructor
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Re: On planet K, there is essentially no atmosphere, so objects in freefal [#permalink]

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New post 19 Oct 2016, 11:30
vsvikas wrote:
hi Mike,
I did not get the solution. could u help?

Dear vsvikas,

I'm happy to respond. :-) You can find a full explanation here:
GMAT Integrated Reasoning: Two-Part Analysis Practice Questions
This question is #5 on that page. Let me know if you have any question about the explanation on that page.

Mike :-)
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Mike McGarry
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Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)

Kudos [?]: 8932 [0], given: 111

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Re: On planet K, there is essentially no atmosphere, so objects in freefal [#permalink]

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New post 19 Oct 2016, 12:10
Thanks mike..I really don't want to put much efforts into IR..I believe 4-5 should be fine..most schools still don't consider IR

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Re: On planet K, there is essentially no atmosphere, so objects in freefal   [#permalink] 19 Oct 2016, 12:10
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