Motion of the roller A against its restraining spring is controlled by the downward motion of the plunger E as shown in the figure below. For an interval of motion the velocity of E is v= 1.3 m/s. Determine the velocity of A when θ becomes 90° using the method of instantaneous centres. Given DB= 60 mm, BO= 100 mm and BA= 120 mm. Take the right-hand direction positive.

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