How long does a ball take to reappear at a certain point when it is thrown up?

1. Sep 5, 2009

1. The problem statement, all variables and given/known data

Sitting in a second-story apartment, a physicist notices a ball moving straight upward just outside her window. The ball is visible for 0.25 s as it moves a distance of 1.06 m from the bottom to the top of the window.

How long does it take the ball to reappear?
What is the greatest height of the ball above the top of the window?

2. Relevant equations

3. The attempt at a solution

Last edited: Sep 5, 2009
2. Sep 5, 2009

noblegas

What kinematic acceleration equations would you considered appropriate when describing a ball falling down from a two story building? What forces are acting upon the ball as it falls down? What forces would you consider negliglble in this scenario?

3. Sep 5, 2009

vf2 = vi2 + 2a$$\Delta$$x