Question:
PLEASE PLEASE HELP me quickly with this math problem???....I have no idea how to do it!!!!?
I love paramore
2010-05-25 20:20:21 UTC
Here is the link to the problem below:

http://s819.photobucket.com/albums/zz111/jem-talan/?action=view¤t=Screenshot2010-05-25at64943PM.png
Four answers:
anonymous
2010-05-28 12:14:43 UTC
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Michael
2010-05-25 20:36:55 UTC
It's a simple quadratic equation. Substitute v=20 and h=4 and solve for t:



4=10t-5t^2

5t^2-10t-4=0

Use the quadratic equation to solve for t and simplify. You will get t=1+/-sqrt(5))5, which is the solution. The ball will be at height 4 twice, once on the way up and once on the way down.
Wile E.
2010-05-25 20:39:34 UTC
h = - 5t² + vt



v = 10

h = 4



4 = - 5t² + 10t, or

- 5t² + 10t = 4



Factor:



- 5(t² - 2t) = 4

t² - 2t = 4 / - 5

t² - 2t = - 0.8



Complete the square:



t² - 2t + 1 = 1 - 0.8

(t - 1)² = 0.2

t - 1 = √0.2

t - 1 = ± 0.447

t = ± 0.447 + 1



Solve for each sign:



If t = + 0.447 + 1,

t = 1.45



If t = - 0.447 + 1,

t = 0.55



t { 0.55, 1.45 }



The ball will be at 4 m. at 0.55 secs. on the way up and at 1.45 sec. on the way down.
PEDO KEVIN PC VIRUS ALERT!
2010-05-28 11:32:06 UTC
READ BEFORE ANSWERING THIS MULTI-ACCOUNT SPAMMER!!!!!





1. YOU ARE DELIBERATELY WASTING HUNDREDS OF PEOPLE'S TIME ASKING THE SAME QUESTIONS!





2. YOU ASK THE EXACT SAME QUESTION ON WELL OVER 5 ACCOUNTS!!!





3. YOU DO NOT WANT HELP, YOU JUST WANT TO FUC PEOPLE OVER.





4. I INVITE ANYONE ELSE TO SEARCH YOUR QUESTIONS ON ALL OF YOUR ACCOUNTS, AND THEY WILL FIND WELL OVER 1,000, OF YOUR QUESTIONS WORDED EXACTLY AS YOU WRITE THEM. 100% EXACTLY.





5. GAME OVER. ANYONE ELSE CAN SEARCH YOUR QUESTIONS IF THEY DOUBT ME!!!!!





6. YOU DO NOT WANT HELP AT ALL YOU LYING SPAMMER!













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