Posted by **gabriela** on Friday, February 21, 2014 at 2:22pm.

Your friend is standing below the window outside of our classroom and attempting to throw a rock past the window to get your attention. The rock is thrown straight up in the air and passes our window 0.40s after being released. It passes the same window on its way back down 1.60s later. What was the initial velocity of the rock? Did the height of the

window matter?

- math -
**Steve**, Friday, February 21, 2014 at 4:26pm
once past the window, the rock spent .8 seconds going up and .8 seconds going down.

So, the rock spent 1.2 seconds going up.

since v = Vo-32t and v(1.2)=0,

Vo-32(1.2)=0

Vo = 38.4

Doesn't matter how high the windows is, though its location is determined by the time intervals indicated.

## Answer This Question

## Related Questions

- physics - You drop a rock from rest out of a window on the top floor of a ...
- physics - You drop a rock from rest out of a window on the top floor of a ...
- Physics - You throw a small rock straight up from the edge of a highway bridge ...
- physics - Bill kicks a rock oﬀ the top of his apartment building. It ...
- Physics - Bill kicks a rock off the top of his apartment building. It strikes a ...
- physics - Bill kicks a rock oﬀ the top of his apartment building. It ...
- physics - Bill kicks a rock off the top of his apartment building. It strikes a ...
- science - Bill kicks a rock off the top of his apt building it strikes a window ...
- Physics I - Bill kicks a rock off the top of his apartment building. It strikes ...
- Physics - A ball thrown upward from the a point 7 meters below the bottom of a ...

More Related Questions