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Moderate

Atwood Machine Acceleration

APPHMC-FE4YGX

Two blocks of masses $2m$ and $m$ are connected by a light string that passes over a massless and frictionless pulley, as shown in the figure above.

What is the acceleration of the system?

A

$g$

B

$3g$

C

$\cfrac{g}{3}$

D

$\cfrac{2g}{3}$

E

$\cfrac{g}{2}$