Discussion
For a rigid link, the velocity of one end of the link related to another end will be :
Answer: C
The velocity is at right angle to the link.
A rigid link cannot change length, so neither end can have any velocity relative to the other along the line joining them. The only relative motion possible is rotation about the other end, and the velocity of a point rotating about another point is perpendicular to the line joining them.
This is the basis of every velocity diagram: the relative velocity of B with respect to A is drawn perpendicular to AB. A component parallel to the link, or at 45° to it, would stretch or shorten the link, and −180° is simply a direction along the link.
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