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+64t+80. How many seconds will it take to reach
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Question 98771: 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+64t+80. How many seconds will it take to reach ground level?
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
it reaches the ground when s=0 ... 0=-16t^2+64t+80 ... dividing by -16 gives 0=t^2-4t-5
factoring gives 0=(t-5)(t+1) ... so t=5 and t=-1 ... the negative value is not realistic
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