A wheel of diameter 40.0 cm starts from rest and rotates with a constant angular acceleration of

Question:

A wheel of diameter 40.0 cm starts from rest and rotates with a constant angular acceleration of 3.00 rad/s2. At the instant the wheel has computed its second revolution compute the radial acceleration of a point on the rim in two ways:
(a) Using the relationship a rad = w2r, and
(b) From the relationship ...... = v2/r.