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## Homework Statement

The diagram shows a block and pulley

system where all the surfaces are

frictionless, and all the pulleys are

massless and frictionless.

Once all Blocks have been let go, what is the ratio of the magnitude of the acceleration, a1, of block 1

to the magnitude of the acceleration of Block 3, a3. That is, what is the ratio a1/a3 ?

## Homework Equations

F=ma

## The Attempt at a Solution

The answer is 2 but I get -2.

On block one FBD

m1 * a1 = T

a=T/m1 = T

FBD on block 3

-T=m3 * a3

a3=-T/m3

a3=-T/2

a1/a3 = -2

Any help would be awesome