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In a lab, you have a cart with mass $M$ being pulled along a track with negligible friction by a string that is hanging over a pulley at the edge of the lab table. There is a mass $2M$ at the end of the string.

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Which of the following values is the predicted acceleration of the system?

A

$2g$

B

$g$

C

$\cfrac { 2g }{ 3 } $

D

$\cfrac { g }{ 2 } $

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