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

Which of the following is equal to $T$?

A

$mg$

B

$3mg$

C

$\cfrac{2mg}{3}$

D

$\cfrac{4mg}{3}$

E

$\cfrac{mg}{3}$

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