Which of the following statements about the instantaneous axis (passing through the centre of mass) is
correct?
(A) It is vertical for both the cases (a) and (b).
(B) It is verticle for case (a); and is at 45° to the x-z plane and lies in the plane of the disc for case (b)
(C) It is horizontal ofr case (a); and is at 45° to the x - z plane and is normal to the plane of the disc for case
(b).
(D) It is vertical of case (a); and is at 45° to the x - z plane and is normal to the plane of the disc for case (b).