Physics
posted by Maria .
A runner’s velocity along a straight track is 3.2 m/s at time 5.0 s and 2.2 m/s at time 13 s. Find the runner’s average acceleration during this time interval.

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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