Answer:
(A) Angular speed 40 rad/sec
Rotation = 50 rad
(b) 37812.5 J
Step-by-step explanation:
We have given moment of inertia of the wheel

Initial angular velocity of the wheel

Angular acceleration

(a) We know that

We have given t = 2 sec
So

Now

(b) After 3 sec

We know that kinetic energy is given by
