6. 1 points StitzPreCalc3 2.3.022. My Notes Ask Your Teacher The height of an ob

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6. 1 points StitzPreCalc3 2.3.022. My Notes Ask Your Teacher The height of an object dropped from the roof of an eighteen story building is modeled by h(t)--16 in feet, t seconds after the object is dropped. How long before the object hits the ground? + 144, 0 t 3. Here, h is the height of the object off the ground, seconds 7. +12 points StitzPreCalc3 2.3.023. My Notes Ask Your Teacher The height h in feet of a model rocket above the ground t seconds after lift-off is given by h(t)--5 height above the ground? + 100t, for 0 t 20-When does the rocket reach its maximum seconds What is its maximum height? feet Submit Answer Save Progress

Explanation / Answer

6. h(t)=-16t2+144

Hit the ground meand h(t)=0

-16t2+144=0

-16(t2-9)=0

t=-3,3

t=3 sec

7.

h(t)=-5t2+100t

t=-b/2a= -100/2(-5) =10sec

h(10)=-5(100)+100(10) =500 feet

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