Posted by Anonymous on Friday, September 21, 2012 at 1:59am.
A roof tile falls from rest from the top of a building. An observer inside the building notices that it takes 0.12 s for the tile to pass her window, which has a height of 2.2 m. How far above the top of this window is the roof?
m

physics  Steve, Friday, September 21, 2012 at 10:44am
if it takes t seconds to reach the top of the window, it takes t+.12 seconds to reach the bottom. In that interval, it falls 2.2m
4.9(t+.12)^2  4.9t^2 = 2.2
t = 1.81
In the 1.81 seconds, it fell
4.9*1.81^2 = 16.05
so, the roof is 16.05m above the top of the window.
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