SOLUTION: A penny is dropped from the top of a 900m tower. How long does it take to hit the ground?

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Question 580633: A penny is dropped from the top of a 900m tower. How long does it take to hit the ground?
Answer by Alan3354(69443) About Me  (Show Source):
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A penny is dropped from the top of a 900m tower. How long does it take to hit the ground?
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s = at^2/2
900 = 4.9t^2
t+=+sqrt%28900%2F4.9%29
t =~ 13.55 seconds (neglecting air friction)