SOLUTION: An object is projected upward from the top of a tower. Its distance in feet above the ground after t seconds is given by s(t)=-16t^2+64t+80. How many seconds will it take to reac
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Question 59420: An object is projected upward from the top of a tower. Its distance in feet above the ground after t seconds is given by s(t)=-16t^2+64t+80. How many seconds will it take to reach ground level?
Answer by funmath(2933) (Show Source): You can put this solution on YOUR website!
An object is projected upward from the top of a tower. Its distance in feet above the ground after t seconds is given by s(t)=-16t^2+64t+80. How many seconds will it take to reach ground level?
let s(t)=0 that's at ground level.
factor
0=(t+1)(t-5)
t+1=0 and t-5=0
t+1-1=0-1 and t-5+5=0+5
t=-1 and t=5
Negative time is not valid.
Therefore
Happy Calculating!!!
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