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In part of an experiment, a certain force acts to do work on an object, and the object's speed increases from rest to a final speed $v$. In the second part of the experiment, four times as much work is done on the same object, again speeding it up from rest.

Which of the following is the object's final speed during the second part of the experiment?

A

${ v }/{ 2 }$

B

$v$

C

$2v$

D

$4v$

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