ME 203 Exam

Summer 2016 Exam 2 Problem 1

I was wondering if the equation for the velocity of block B would be different than the equations for velocity of pulleys? I'm not sure if you simply add the velocities of the strings or if you use V1+V2=2Vb to solve for the velocity of the block (Vb).
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The velocity of the block is equal to the velocity of the cable on the left of the pulley A as well as the velocity of the center of the lower pulley.
Awesome, thank you!