Question

Calculate the work done in pushing a cart through a distance of 50m against the force of friction equal to 250N.

Answer 1

Work =  force × displacement
         = 250N × 50m
         = 12500 J
the work done is negative because the force of friction and the displacement are acting in the opposite direction.

Answer 2

given that , Force = 250 N  ( F )
                 distance = 50 m ( s ) 
     for calculating work done = F * S
 work done - Force * distance 
                = 250N * 50 
                = 12500 joules  ( 12.5 KJ )