Friday

February 27, 2015

February 27, 2015

Posted by **Anonymous** on Friday, July 6, 2012 at 8:26am.

Answer

0.7 seconds

- Math -
**Reiny**, Friday, July 6, 2012 at 8:35amwhen it hits the ground, s(t) = 0

-16t^2 + 192t + 144 = 0

t^2 - 12t - 9 = 0

I will complete the square rather than use the quadratic formula

t^2 - 12t + 36 = 9 + 36

(t-6)^2 = 45

t-6 = ±√45

t = 6 ± √45

= appr -.7 or 12.7

since t > 0, it will hit the ground 12.7 after it was tossed.

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