A runner circles a track of radius 100 m in 100 s moving at a constant rate. If the runner was initially moving east, what has been the runner's average acceleration when halfway around the track?
a. At a constant rate, the average acceleration would be zero.
b. 0.13 m/s2, south
c. 0.25 m/s2, west
d. No answer is correct.
C
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