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prep question

This topic has 1 expert reply and 1 member reply
jc114 Senior | Next Rank: 100 Posts Default Avatar
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prep question

Post Mon May 07, 2007 3:47 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    "If Fran jumps straight up off the floor and lands on her feet T seconds later, her feet will reach a maximum height of 1.22T^2 meters above the floor. On one such jump, was Fran off the floor for less than 1 sec?
    (1) On her jump Fran's feet reached a maximum height of 1 meter above the floor
    (2) On her jump, Frain spent more than 1/4 second ascending

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    jayhawk2001 Community Manager
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    Post Mon May 07, 2007 9:05 pm
    jc114 wrote:
    "If Fran jumps straight up off the floor and lands on her feet T seconds later, her feet will reach a maximum height of 1.22T^2 meters above the floor. On one such jump, was Fran off the floor for less than 1 sec?
    (1) On her jump Fran's feet reached a maximum height of 1 meter above the floor
    (2) On her jump, Frain spent more than 1/4 second ascending
    1 - sufficient. 1.22T^2 = 1, we can solve for T and hence know if it is > 1 or
    < 1

    2 - insufficient. If the ascend is 1/3sec, then the total is 2/3 sec which is < 1.
    If the ascend is 1 sec, then total = 2 sec which is > 1

    I'd vote for A

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    Stacey Koprince GMAT Instructor
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    Post Tue May 08, 2007 11:44 am
    Yep - please don't forget to post the source.

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