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2015-03-15T09:41:04+05:30

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Work = force × displacement
       = 250N × 50m
       = 12500 J
the work done is negative because the force of friction and displacement are acting in the opposite direction.
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2015-03-15T12:33:10+05:30
Work done =force(F)*displacement(S)
               =250 N*50 m
               =12500 Nm
               =12500 J
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