Homework Help: science

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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