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September 23, 2014

September 23, 2014

Posted by **Milly** on Monday, September 5, 2011 at 3:30pm.

- Math -
**Henry**, Wednesday, September 7, 2011 at 3:28pmWhen the ball strikes the water, the ht above water will be 0.

h = -16t^2 +32t + 180 = 0,

Solve for t using the Quadratic Formula

and get:

t = -2.5, and 4.5s.

Select the positive value t:

t = 4.5s.

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