# Dependent motion of pulleys

1. Jan 16, 2010

### jonnycbgood

The slider block B moves to the right with a constant velocity of 20in/s. Determine (a) the velocity of block A, (b) the velocity of portion D of the cable, (c) the relative velocity of A with respect to B, (d) the relative velocity of portion C of the cable with respect to portion D.

Two blocks rest on a flat frictionless surface. block A is on the left & block B is on the right. A cord (section C) stretches from block B to a pulley attached to block A, the cord (section D) continues back to another pulley attached to block B and ends in between both blocks at a fixed point. Sorry this the best description of the picture I can do.

Since block B has a constant velocity the acceleration is zero.

X = Xo + Vt

I am trying to apply the theory of dependent motions with the equation
Xa + 2Xb = constant. But I am at a complete lost. Any assistance is greatly appreciated.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution