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A runner moving at a constant speed of 12.5m/s rounds a curve of radius 4.20m. Compute the acceleration the runner. (State the magnitude of this acceleration

Are these numbers realistic? Yes or no

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Arturo O. | Experienced Physics Teacher for Physics TutoringExperienced Physics Teacher for Physics ...
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This is another case of centripetal acceleration; but unlike the problem you posted just above this one, work it in terms of speed and radius.
ac = v2/r = (12.5 m/s)2 / (4.20 m) = ?
You should be able to finish from here.