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In the figure shown, crank AB is 15 cm long and is rotating at 10rad/sec C is vertically above A. CA equals 25cm. C is a swivel trunnion through which BD (40cm.) slides. If ABCD becomes a vertical line during its motion, the angular velocity of the swivel trunnion at that instant will be           

                                    

(a) Zero                    (b) (100/25) rad/s

(c) (100/15) rad/s     (d) (100/10) rad/s                                                         

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