Asked by sue

A model rocket is launched with an initial upward velocity of
164
/
ft
s

. The rocket's height
h

(in feet) after
t

seconds is given by the following.
=
h

164
t
16
t
2

Find all values of
t

for which the rocket's height is
92

feet.

Round your answer(s) to the nearest hundredth.
(If there is more than one answer, use the "or" button.)

Answers

Answered by Reiny
First let me fix your post:

A model rocket is launched with an initial upward velocity of
164 ft/s. The rocket's height h (in feet) after t seconds is given by the following.
h = −16t^2 + 164t
Find all values of t for which the rocket's height is 92 feet.

so you want:
92 = -16t^2 + 164t
16t^2 - 164t + 92 = 0
4t^2 - 41t + 23 = 0
Use the quadratic equation to solve.
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