Dynamics question related to conservation of string

AI Thread Summary
The discussion revolves around a dynamics problem involving two blocks connected by a cord, specifically focusing on the velocity of block A when block B moves to the right at 300 mm/s. The equation provided for the cord length, 2xb - 3xa = constant, is questioned for clarity and correctness. The user expresses confusion about the total cord length and proposes an alternative equation. The conversation emphasizes the importance of understanding the relationships between the blocks' movements and the cord's constraints. Ultimately, grasping these concepts is crucial for solving the problem accurately.
edgarpokemon
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Homework Statement


http://tinypic.com/r/10f5ni8/9
http://[PLAIN]http://i66.tinypic.com/10f5ni8.png

Homework Equations


I have a problem understanding this problem. It asks for the velocity of block A when block B is moved 300mm/s to the right. The equation for the cord length is given as 2xb-3xa=constant.

The Attempt at a Solution


I don't understand the equation at all. wouldn't the total cord of the length be xb + (xb-xa) +2xa= constant? help! i understand how to get velocities and all the problems similar to this one, but expect this one :(
 
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