A ring of radius 1 m is rolling without slipping over a rough horizontal surface with a velocity v0 = √2 m/s. Two points are located at A and B on the rim of the ring what is the speed of A w.r.t. B in m/s.
(A) √2 m/s.
(B) 1 m/s.
(C) 2 m/s.
(D) 2 √2 m/s.