A wheel ( to be considered as a ring ) of mass m and radius R rolls without sliding on a horizontal surface with constant velocity v. It encounters a step of height R/2 at which it ascends without sliding
A. the angular velocity of the ring just after it comes in contact with step is 3v/4R
B. the normal reaction due to the step on the wheel just after the impact is `(mg)/(2)-(9mv^(2))/(16R)`
C. the normal reaction due to the step on the wheel increases as the wheel ascends.
D. the friction will be absent during the ascent.
