Answers

2016-05-08T02:33:52+05:30
Negative of the work done by the friction is equal to the work done against friction.

In this case .... .............
work done by friction is:

         -                                             100          X     3          =    -300
(negative                                        (force)            (distance)
because
of opposite
direction of
force and direction
of movement )

So therefore work done against friction is simply 300J.

So the answer is (1).


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