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

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Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.