SOLUTION: Round to the nearest tenth, if necessary. A rock falls from a tower that is 432 feet high. As it is falling, its height is given by the formula h = 432 - 16t^2. How many seconds wi

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons -> SOLUTION: Round to the nearest tenth, if necessary. A rock falls from a tower that is 432 feet high. As it is falling, its height is given by the formula h = 432 - 16t^2. How many seconds wi      Log On


   

Question 173414This question is from textbook Introductory Algebra
: Round to the nearest tenth, if necessary. A rock falls from a tower that is 432 feet high. As it is falling, its height is given by the formula h = 432 - 16t^2. How many seconds will it take for the rock to hit the ground (h=0)? This question is from textbook Introductory Algebra

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Round to the nearest tenth, if necessary. A rock falls from a tower that is 432 feet high. As it is falling, its height is given by the formula h = 432 - 16t^2. How many seconds will it take for the rock to hit the ground (h=0)?
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432-16t^2 = 0
Divide theu by 16 to get:
27 = t^2
t = 3sqrt(3) seconds
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Cheers,
Stan H.