SOLUTION: A rock falls from a tower that is 208 feet high. As it is falling, its height is given by the formula h= 208-16t^2. how many seconds will it take for the rock to hit the ground (h=

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: A rock falls from a tower that is 208 feet high. As it is falling, its height is given by the formula h= 208-16t^2. how many seconds will it take for the rock to hit the ground (h=      Log On

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Question 299665: A rock falls from a tower that is 208 feet high. As it is falling, its height is given by the formula h= 208-16t^2. how many seconds will it take for the rock to hit the ground (h=0)?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
h= 208-16t^2
Since
h is height
t is time (secs)
.
Set h=0 and solve for t:
h= 208-16t^2
0= 208-16t^2
16t^2 = 208
t^2 = 208/16
t^2 = 13
t = sqrt(13)
t = 3.61 seconds