Theory of Machine
The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

ω² × OQ
ω² × OQ sinθ
ω² × OQ cosθ
ω² × OQ tanθ

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
Kinematic pairs are those which have

Two elements that permit relative motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically
Point or line contact between the two elements when in motion

ANSWER DOWNLOAD EXAMIANS APP