SOLUTION: The height of a rock dropped off the top of a 72-foot cliff over the ocean is given in feet by h(t) = 72 - 16t^2, where t is the number of seconds since it is released. How long do

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Question 1104583: The height of a rock dropped off the top of a 72-foot cliff over the ocean is given in feet by h(t) = 72 - 16t^2, where t is the number of seconds since it is released. How long does it take the rock to hit the water?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!

h(t) = 72 - 16t^2
At impact, h(t) = 0
72 - 16t^2 = 0
Solve for t.