A runner having mass of 55 kg moving at a speed of 9 m/s rounds a bend with a radius of 18 m. What is the centripetal acceleration and centripetal force of the runner? (Do all required steps )

centripetal acceleration = 4.5 m/s^2 ; centripetal force = 247.5 N

Explanation:

centripetal acceleration  = v^2 / r = 9^2 / 18 = 4.5 m/s^2

centripetal force = mv^2 / r = 4.5 x 55 = 247.5 N

whichever one it is, it's definitely not one that you included on the list you provided.