A horizontal force of 20 newtons eastward causes a 10-kilogram box to have a displacement of 5 meters eastward. The total work done on the box by the 20-newton force is

(1) 40 J

(2) 100 J

(3) 200 J

(4) 1000 J

The first thing you should remember is the definition of work

W = F * d

Where

W: Work done.

f: Force

d: Distance.

Substituting the values we have:

W = (20) * (5) = 100Nm = 100J

The answer is

(2) 100J

To get the total work, you will add the Applied work + frictional work.

applied work = 20N x 5meter which is the displacement

frictional work = Weight x displacement

where the weight = mass x gravitational acceleration

weight=10 kg x 9.8 m/s^2

=98 kg m/s^2 or Newton

work = N x m

=98 N x 5 meters

=490

Total work = 490-450

40 Joules

answer is letter A.