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A t-shirt is fired straight up from a t-shirt cannon at ground level. After t seconds, its height ab ove the ground is h meters, where h=-16t^(2)+48t. how long the t-shirt was at least 27 meters above the ground. 

t=9/4,3/4

 Oct 12, 2020
 #1
avatar+27695 
+1

Substitute in 27 for h in the equation

 

27 = -16t^2 + 48t        use quadratic formula to find TWO values of t   one is the the shirt going up....the other is the shirt coming down

                                       the time the shirt is at least 27 m above the ground is the difference of these two times.....

 
 Oct 12, 2020
 #2
avatar+332 
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thanks you!!

 
xxJenny1213xx  Oct 12, 2020
 #3
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0

You're welcome, xxJ...........

 
ElectricPavlov  Oct 12, 2020

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