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In the given, ABCD is a four-bar mechanism, at the instant shown AB CD are vertical and BC is horizontal. AB is shorter than CD by 30 cm, AB is rotating at 5 rad/s and CD is rotating at 2 rad/s. The length of AB is   

     

 

         (a) 10 cm                                    (b) 20 cm

         (c) 30 cm                                    (d) 50 cm

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