# Q. 16.     An object of mass, $m$ is moving with a constant velocity, $v$. How much work should be done on the object in order to bring the object to rest?

At this moment the energy of the object is :

$K.E.\ =\ \frac{1}{2}mv^2$

Thus in bringing the object to rest the work needed is :  $=\ K.E.$

$W\ =\ \frac{1}{2}mv^2\ J$

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