A block is pulled across the floor by a pull of 400 N at an angle
of 35˚ with the horizontal. The force of the kinetic friction is 150
N, and the block is moved a horizontal distance of 23 m. What
is the resultant work?
I am not sure what they mean by "resultant work"
The work done by the person pulling is
400*cos35*23 m= 7536 J
Of that work, 150*23 = 3450 J is done against friction.
The resultant force acting on the block does 7536-3450 = 4086 J of work.