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A certain ball was dropped from a window 8 meters above a sidewalk. On

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A certain ball was dropped from a window 8 meters above a sidewalk. On  [#permalink]

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New post 26 Nov 2015, 05:40
00:00
A
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C
D
E

Difficulty:

  35% (medium)

Question Stats:

69% (00:56) correct 31% (00:58) wrong based on 125 sessions

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A certain ball was dropped from a window 8 meters above a sidewalk. On each bounce it rose straight up exactly one-half the distance of the previous fall. After the third bounce the ball was caught when it reached a height of exactly 1 meter above the sidewalk. How many meters did the ball travel in all?

(A) 21
(B) 19
(C) 17
(D) 15
(E) 13

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Re: A certain ball was dropped from a window 8 meters above a sidewalk. On  [#permalink]

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New post 26 Nov 2015, 06:26
Before the first drop , the ball has travelled 8m
after first drop , the ball rises 4m and falls another 4m
after second drop , the ball rises 2m and falls another 2m
after third drop , the ball rises 1m
Distance = 8 + 2*4 + 2 *2 + 1
= 21

Answer A
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Re: A certain ball was dropped from a window 8 meters above a sidewalk. On  [#permalink]

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New post 27 Nov 2015, 23:01
1
As Shown in the image below
8+4+4+2+2+1 = 21

Ans :A
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Re: A certain ball was dropped from a window 8 meters above a sidewalk. On  [#permalink]

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New post 21 Jul 2017, 13:09
8(initial fall)+4+4(1st bounce and fall) 2+2(2nd bounce and fall) +1(third bounce)=21m.
Option A.
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Re: A certain ball was dropped from a window 8 meters above a sidewalk. On  [#permalink]

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New post 27 Jul 2018, 08:11
Hello from the GMAT Club BumpBot!

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Re: A certain ball was dropped from a window 8 meters above a sidewalk. On &nbs [#permalink] 27 Jul 2018, 08:11
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