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In a four bar mechanism ABCD link AD is fixed and the crank AB rotates at 10 rad.......

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Question: 

In a four bar mechanism ABCD link AD is fixed and the crank AB rotates at 10 radians per second in clockwise, lengths of the links are AB = 60 mm, BC = CD = 70 mm, DA = 120 mm, when angle DAB = 60 and both B and C lie on the same side of AB, find angular velocities of BC and CD link.

Answer: 

b