A runner circles a track of radius 100 m one time in 100 s at a constant rate.The greatest change in his velocity from his starting velocity:

A runner circles a track of radius 100 m one time in 100 s at a constant rate.The greatest change in his velocity from his starting velocity:
A)occurs one-fourth of the way around the track.
B)occurs one-half of the way around the track.
C)occurs three-fourths of the way around the track.
D)Both a and c are correct.

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