Posted by Anonymous on Sunday, February 5, 2012 at 12:11am.
An object is dropped off of a 27 meter tall building.
How long is it in the air before it hits the ground?
To measure the height of a tree, a person throws a ball vertically upward, and takes 13 seconds to reach its maximum height which is exactly the height of the tree.
How tall is the tree?

science  drwls, Sunday, February 5, 2012 at 4:50am
One question at a time, please.
The distance a dropped ball falls in time t is
y = (g/2)t^2
In the first question, use that formula to solve for t.
In the second question, I believe your time tom reach the top of the tree should be 1.3 seconds, not 13. Otherwise the tree is unrealistically high. Recheck the problem statement.
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