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09 May 2017, 03:01
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B
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Difficulty:
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53% (01:19) correct
47%
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wrong
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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.
(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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09 May 2017, 12:07
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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
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
09 May 2017, 12:54
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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.
Option D is the answer.
_____________________________________________________
If you appreciate the answer then please click +1Kudos
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.
Option D is the answer.
_____________________________________________________
If you appreciate the answer then please click +1Kudos
