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September 2, 2014

September 2, 2014

Posted by **jill** on Wednesday, April 9, 2014 at 9:35pm.

- math -
**Reiny**, Wednesday, April 9, 2014 at 10:07pmI will assume you are not taking Calculus, but have studied the quadratic function, and know how to complete the square

y = -16(x^2 - 2x)

= -16(x^2 - 2x + 1 - 1)

= -16( (x-1)^2 - 1)

= -16(x-1)^2 + 16

so the vertex is (1,16)

suggesting that the max height is 16 after 1 second

so it takes 1 second to up and 1 second to come back down, for a total of 2 seconds for the ball to hit the ground again.

graph?

make a table of values of x and y

and plot

http://www.wolframalpha.com/input/?i=plot+y%3D-16x%5E2+%2B32x

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