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March 29, 2015

March 29, 2015

Posted by **Thomson** on Thursday, March 14, 2013 at 4:10pm.

A 2m length of board rests with one end on the floor and the other end on a small stack of bricks. A baseball is rolled up the board and back down again in a total of 4 seconds. The farthest the baseball reached on the board was 130cm.

Draw a graph of this. [distance time]

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I would appreciate it if someone could tell me the general shape or link me to a graph made on a graphing site.

- math -
**Steve**, Thursday, March 14, 2013 at 4:48pmwell, it's a parabola, with

y(0) = 0

y(4) = 0

so we know that the max height is reached at y=2.

y(2) = 130

so, the vertex is at (2,130)

y(t) = -a(t-2)^2 + 130

Now, we know that y(0) = 0, so

0 = -a(4)+130

a = 130/4

y(t) = -130/ (t-2)^2 + 130

visit http://rechneronline.de/function-graphs/

and type in

-130/4 * (x-2)^2 + 130

set the x interval to 0,4

and y to 0,150

and you will see the graph

- math -
**Thomson**, Thursday, March 14, 2013 at 4:51pmThank you.

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