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A model rocket takes off from an elevated launch pad which i
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22 Apr 2020, 13:09
22 Apr 2020, 13:09
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A model rocket takes off from an elevated launch pad which is 32 feet above the ground. The rocket’s elevation is given by the function\( h(t) = −16t^2 + 64t + 32\), where \(h(t)\) represents the height, in feet above ground, after t seconds. At which of the following times, in seconds, is the rocket’s height 80 feet above ground?
Indicate all such values.
A. 0.5
B. 1
C. 2
D. 2.5
E. 3
F. 4
Indicate all such values.
A. 0.5
B. 1
C. 2
D. 2.5
E. 3
F. 4
Re: A model rocket takes off from an elevated launch pad which i
[#permalink]
23 Apr 2020, 01:05
23 Apr 2020, 01:05
1
We're given the equation 16t^2 + 64t + 32 = 80
Thus, 16t^2 + 64t = 48
16t^2 + 64t - 48 = 0
16(t^2 + 4t - 3) = 0
On solving further, we get t = 3 or 1.
Thus, answer is B and E.
Thus, 16t^2 + 64t = 48
16t^2 + 64t - 48 = 0
16(t^2 + 4t - 3) = 0
On solving further, we get t = 3 or 1.
Thus, answer is B and E.
Re: A model rocket takes off from an elevated launch pad which i
[#permalink]
30 May 2021, 10:04
30 May 2021, 10:04
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Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
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