SOLUTION: Tom drops a rock off the edge of a 324 foot cliff. The height of the rock after t seconds is given by h = -16t2 + 324. How long until the rock hits the ground below? Round your

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Question 633502: Tom drops a rock off the edge of a 324 foot cliff. The height of the rock after t seconds is given by h = -16t2 + 324. How long until the rock hits the ground below? Round your answer to the nearest tenth of a second.

Answer by Alan3354(69443) About Me  (Show Source):
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Tom drops a rock off the edge of a 324 foot cliff. The height of the rock after t seconds is given by h = -16t2 + 324. How long until the rock hits the ground below? Round your answer to the nearest tenth of a second.
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At impact, h = 0
-16t%5E2+%2B+324+=+0
Solve for t, ignore the negative solution.