(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

home run hit and baseball just clears the top of the bleachers.

@= 35 degrees

bleacher height = 21 meters

distance from bleachers to home plate = 130 meters

neglect air resistance

find initial velocity and time of flight

2. Relevant equations

x comp:

x= vcos@ t + at^2/2

y comp

y= vsin@ t + at^2/2

vf^2= vi^2 + 2a(delta x)

3. The attempt at a solution

The thing is, in order to solve for velocity itd help to know the time and to solve for time itd help to know the velocity. So i thought i'd use vf^2= vi^2 + 2a(delta x) since it doesn't have time in the equation. I got

0= (vi cos 35)^2 + 2(9.8) (130)

i keep getting a negative inside the square root and im stuck.

I just need a hint into the right direction, am i approaching this problem incorrectly?

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# Homework Help: Find initial velocity only need hint

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