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

Question

Are these numbers realistic? Yes or no

Answer 1

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.

 

a_c = v²/r = (12.5 m/s)² / (4.20 m) = ?

 

You should be able to finish from here.