Posted by Maria on Wednesday, October 20, 2010 at 6:09pm.
a = (Vf - Vo) / (Tf - To),
a = (2.2 - 3.2) / (13 - 5),
= -1 / 8 = -0.125 m/s^2.
The neg sign means that the runner was actually slowing down or decelerating.
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