SOLUTION: A ball is thrown from and A ball is thrown from an initial height of 3 m with an initial upward velocity of 25 m/s. The balls height “h” (in meters) after “t” seconds is gi

Algebra ->  Rate-of-work-word-problems -> SOLUTION: A ball is thrown from and A ball is thrown from an initial height of 3 m with an initial upward velocity of 25 m/s. The balls height “h” (in meters) after “t” seconds is gi      Log On


   



Question 1146518: A ball is thrown from and A ball is thrown from an initial height of 3 m with an initial upward velocity of 25 m/s. The balls height “h” (in meters) after “t” seconds is given by the following.
H=3+25t-5t^2
Find all values of “t” for which the balls height is 8 meters.
Round answer to the nearest hundredth

Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
---------------------------------------
H=3+25t-5t^2
Find all values of “t” for which the balls height is 8 meters.
Round answer to the nearest hundredth
-----------------------------------


-5t%5E2%2B25t%2B3=8
-5t%5E2%2B25t-5=0
t%5E2-5t%2B1=0
t=%285%2B-+sqrt%2825-4%29%29%2F2
t=%285%2B-+sqrt%2821%29%29%2F2
0.21 and 4.79