# physics

posted by .

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 -

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.

## Similar Questions

1. ### Physics

A roof tile falls from rest from the top of a building. An observer inside the building notices that it takes 0.2s for the tile to pass her window, whose height is 1.6m. How far above the top of this window is the roof?
2. ### physics

A roofing tile falls from rest off the roof of a building. An observer from across the street notices that it takes 0.48 s for the tile to pass between two windowsills that are 3.0 m apart. How far is the sill of the upper window from …
3. ### Physics

A roofing tile falls from rest off the roof of a building. An observer from across the street notices that it takes 0.42 s for the tile to pass between two windowsills that are 3.08 m apart. How far is the sill of the upper window …
4. ### Physics

A roofing tile falls from rest off the roof of a building. An observer from across the street notices that it takes 0.42 s for the tile to pass between two windowsills that are 3.08 m apart. How far is the sill of the upper window …
5. ### College Physics

A roofing tile falls from rest off the roof of a building. An observer from across the street notices that it takes 0.35 s for the tile to pass between two windowsills that are 2.45 m apart. How far is the sill of the upper window …
6. ### math

A steel ball is dropped from rest from the roof of a building. An observer standing behind a window that is part way down the building 120 cm high notes the ball takes 0.125 s to fall from the top to the bottom of the window. The ball …
7. ### Physics

A roof tile falls from rest from the top of a building. An observer inside the building notices that it takes 0.10 s for the tile to pass her window, which has a height of 1.18 m. How far above the top of this window is the roof?
8. ### Physics

A roof tile of 0.2kg drops 10m from the top of the building to the ground if a tile falls with a uniform velocity calculate its k.E as it stricks the ground using kinematic principle
9. ### Trigonometry

A building is 50 feet high. At a distance away from the building, an observer notices that the angle of elevation to the top of the building is 41 degrees. How far is the observer from the base of the building?
10. ### physics

a brick is dropped form the roof of a building. On the way down it passes a 2m high window and is observed to pass from the top to the bottom of the window in 0.25s. (a) How fast was it moving when it passed the top of the window?

More Similar Questions

Post a New Question