Q .     A body of mass `10\ kg` is moving on a horizontal surface by applying a force of `10\ N` in forward direction. If body moves with constant velocity, the work done by force of friction for a displacement of `2\ m` is :

UPSEE 2015
A

`-20\ J`

B

`10\ J`

C

`20 J`

D

`-5\ J`

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