The direction of linear velocity of any point on a link with respect to another point on the same link is
(a) parallel to the link joining the points
(b) perpendicular to the link joining the points
(c) at 45^0 to the link joining the points
(d) none of the mentioned
This question was addressed to me in examination.
This interesting question is from Linear Velocity in chapter Kinematics & Kinetics of Motion of Machine Kinematics