A runner circles a track of radius 100 m in 100 s moving at a constant rate.If the runner was initially moving north, what has been the runner’s average acceleration

A runner circles a track of radius 100 m in 100 s moving at a constant rate.If the runner was initially moving north, 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)2 m/s2, west
C)0.25 m/s2, south
D)No answer is correct.

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