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mashac

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## Homework Statement

Question:

2 Blocks A and B are resting on a horizontal plane and connected by a cord as shown in figure. The Block A starts from rest and moves to the left with constant acceleration.It was observed that the Block B attains a velocity of 12 m/s after moving a distance of 24 m.

Find acceleration of Blocks A & B.

http://img862.imageshack.us/img862/9556/0806201127481.jpg

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## Homework Equations

## The Attempt at a Solution

In the solution there is an equation 3*accel of B+2*accel of A=0. I didn't understand this equation and the reason for using it. Is it a special property of cord? .I know how to find accel of Block B but to find accel of Block A this equation is used. Please, explain me about this equation and in what situations it is used.

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