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A block of mass $m$ is attached to a string hanging from the ceiling of a moving elevator. The tension in the string is $2mg$.

Which of the following best describes the magnitude and direction of the acceleration of the elevator?

A

It has zero acceleration.

B

It accelerates $g$ downward.

C

It accelerates $g$ upward.

D

It accelerates $2g$ downward.

E

It accelerates $2g$ upward.

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