Posted by **monnie** on Friday, October 8, 2010 at 6:00pm.

A steel ball is dropped from a building's roof and passes a window, taking 0.13 s to fall from the top to the bottom of the window, a distance of 1.20 m. It then falls to a sidewalk and bounces back past the window, moving from bottom to top in 0.13 s. Assume that the upward flight is an exact reverse of the fall. The time the ball spends below the bottom of the window is 2.13 s. How tall is the building?

- Physics -
**bobpursley**, Friday, October 8, 2010 at 6:44pm
figure the average velocity in the window (distance/time). That is the velocity in the center of the window. call that Va

Va^2=2gd solve for d, the distance from the top of the building to the center of the window.

Now do the same for the upward flight.

Notice it took 2.13 sec/2 to hit the ground, so

hf=Va*1.065 -4.9*1.065^2 solve for hf, the distance below the center of the window.

How tall is the building? hf+d

## Answer This Question

## Related Questions

- math - A steel ball is dropped from rest from the roof of a building. An ...
- Physics - two students working on physics assignment to find out how far window ...
- physics - A stone is dropped from edge of a roof and is observed to pass a ...
- physics - A stone is observed falling past a small window 1 meter tall in 0.2 ...
- physics - A pot with a flower falls out of a window box in a tall apartment ...
- Physics - A stone, initially at rest, is dropped from the top of a building. On ...
- physics - A ball is dropped from an upper floor, some unknown distance above ...
- physics - While working on your physics homework in your dorm room you notice a ...
- Physics - A stone is dropped from the root of a building. A person in the ...
- physics - A ball is thrown upward off the top of a 30-meter high building. 10 ...

More Related Questions