question_answer 50)

                  In Fig. what will be the sign of die velocity of the point P', which is the projection of the velocity of the reference particle P. P is moving in a circle of radius R in anticlockwise direction.

Answer:

                  As particle moves from A to P anticlockwise direction, the velocity of the projection is towards O i.e., along negative x-axis. Hence sign of the velocity will be negative.