SOLUTION: Solve the problem. Round to the nearest tenth, if necessary. A rock falls from a tower that is 432 feet high. As it is falling, it's height is given by the formula h= 432- 16t^2.

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Solve the problem. Round to the nearest tenth, if necessary. A rock falls from a tower that is 432 feet high. As it is falling, it's height is given by the formula h= 432- 16t^2.       Log On


   

Question 251316: Solve the problem. Round to the nearest tenth, if necessary.
A rock falls from a tower that is 432 feet high. As it is falling, it's 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)?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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Solve the problem. Round to the nearest tenth, if necessary.
A rock falls from a tower that is 432 feet high. As it is falling, it's 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)?
:
432- 16t^2 = 0
-16t^2 = -432
Multiply both sides by -1
16t^2 = 432
t^2 = 432%2F16
t^2 = 27
t = sqrt%2827%29
t = 5.2 sec
;
;
Check solution on calc:
Enter -16(5.2^2) + 432 = -.6 ~ 0