Determine the magnitude of its maximumradial acceleration

1. Sep 17, 2010

gap0063

1. Before throwing a 0.821 kg discus, an ath-lete rotates it along a circular path of radius1.19 m. The maximum speed of the discus is18.7 m/s.Determine the magnitude of its maximumradial acceleration.Answer in units of m/s2

2. Relevant equations
atotal = sq rt (a2 radial + a2 tangential) where aradial = −v2/r and atangential = d|v|/dt

3. The attempt at a solution
I tried using the equation above but I don't think I have enough info or I don't know where the info goes

2. Sep 17, 2010