Question

calculate the work done in pushing a card to a distance 50 m against the force of friction equal to the 250 Newton also state the type of work done

Answer 1

here is ur answer

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.

Answer 2

Work = Force × Distance
= 250N × 50m
= 12500 J
= 12.5 kJ

Work done is 12.5kJ and is positive since angle between force and displacement vectors is 0°