Posted by **Leah** on Sunday, May 13, 2012 at 5:48pm.

A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?

- Physics -
**bobpursley**, Sunday, May 13, 2012 at 7:16pm
Horizontal:

97.5=vi*5.5

so vihorizontal= 97.5/5.5 m/s

vertical: at the top, the vertical veloicty is zero, so

0=viy-1/2 g*3^3

viy=4.9*9g

so now we have the vertical and horizontla components.

finally

hf=viy^t-1/2 g t^2 so at t=5.5, knowing viy, calculate hf.

- Physics -
**abebe**, Friday, June 15, 2012 at 11:56am
5.5

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