# Free Fall question

1. Nov 21, 2005

### Kandy

A roof tile falls from rest from the top of building. An observer inside the building notices that it takes 0.20 s for the tile to pass her window, whose height is 1.6 m. How far above the top of this window is the roof?

I attempted this question about 2 or 3 different ways but they don't work. I was wondering if it was 0.20s for the tile to go from the top of the window to the bottom of the window or from the roof to the bottom of the window, or something else. And the window having a height of 1.6m, does that mean from the top of the window to the bottom of the window it measures 1.6m? or from the gound to the bottom of the window, or from the ground to the top of the window?

2. Nov 21, 2005

### Fermat

The height of the window is 1.6m. That's the distance from the top of it to the bottom of it.
The tile passes the window. It won't have passed the window unless it has passed all of it. So it must be 0.2s to pass by the botttom of the window, with the time starting from the top of the building.