SOLUTION: A person drops an object from a plaza that is 729 feet tall. The height H of the object after T seconds is given by the equation H = -16t squared + 729. Find how many seconds pas

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equation Customizable Word Problems -> SOLUTION: A person drops an object from a plaza that is 729 feet tall. The height H of the object after T seconds is given by the equation H = -16t squared + 729. Find how many seconds pas      Log On


   

Question 78612This question is from textbook Beginning Algebra
: A person drops an object from a plaza that is 729 feet tall. The height H of the object after T seconds is given by the equation H = -16t squared + 729. Find how many seconds pass before the object reaches the ground. This question is from textbook Beginning Algebra

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A person drops an object from a plaza that is 729 feet tall. The height H of the object after T seconds is given by the equation H = -16t squared + 729. Find how many seconds pass before the object reaches the ground.
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When it reaches the ground H=0.
Solve -16t^2+729=0
t^2=729/16
t=sqrt(729)/4 seconds
t=6.75 seconds
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Cheers,
Stan H.