Compute the final angular speed of the discus

Question

_{A discus thrower accelerates a discus from rest to a speed of 25.8 m/s by whirling it via 1.26 rev. Suppose that the discus moves on the arc of a circle 1.03 m in radius.}

_{(i) Compute the final angular speed of the discus.}

_{(ii) Find out the magnitude of the angular acceleration of the discus, supposing it to be constant.}

_{(iii) Compute the time interval needed for the discus to accelerate from rest to 25.8 m/s.}