Question: A typical running track is an oval with 74-m-diameter half circles at each end. A runner going once around the track covers a distance of

A typical running track is an oval with 74-m-diameter half circles at each end. A runner going once around the track covers a distance of $400 \mathrm{~m}$. Suppose a runner, moving at a constant speed, goes once around the track in $1 \mathrm{~min} 40 \mathrm{~s}$. What is her centripetal acceleration during the turn at each end of the track?

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