A roof tile falls from rest from the top of a building. An observer inside the building notices that it takes 0.19 s for the tile to pass her window, whose height is 1.4 m. How far above the top of this window is the roof?(adsbygoogle = window.adsbygoogle || []).push({});

My train of thought is:

You are given the initial Velocity (Vo=zero m/s), acceleration (-9.8 m/s^2), and the instantaneous velocity of when the tile passes the window (1.4/0.19 = 7.36 m/s)

So you use the instantaneous velocity and plug it into the equation

Vf=Vo+(a)(t) to find the amount of time it took to get to the window.

But if I do that, I get a negative time. I'm not sure where to go here because I can't proceed with a negative time.

After that, my idea was to take the time, and insert it into another equation and find the distance. Even if I neglect that I get a negative time, I still get the incorrect answer after plugging it in to a different equation. So I think I have two problems I need to overcome.

Thanks for the help,

Logan

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Falling roof tile

**Physics Forums | Science Articles, Homework Help, Discussion**