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A 78 kg runner taking part in a 200 m dash must run around the end...

A 78 kg runner taking part in a 200 m dash must run around the end of a track that has a circular arc with a radius of curvature of 26 meters. if he completes the 200 m dash in 22.34 s and runs at constant speed throughout the race, what is the magnitude of his centripetal force as he runs the curved portion of the track?
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