The work done by the teacher is 100.0 J
Explanation:
The work done by a force pushing an object is given by
[tex]W=Fd cos \theta[/tex]
where
F is the magnitude of the force
d is the displacement of the object
[tex]\theta[/tex] is the angle between the direction of the force and of the displacement
In this problem, we have
F = 20.0 N is the force applied
d = 5.0 m is the dispalcement of the desk
[tex]\theta=0^{\circ}[/tex], since the force is applied horizontally
Substituting, we find the work done by the teacher:
[tex]W=(20.0)(5.0)(cos 0)=100.0 J[/tex]
Learn more about work:
brainly.com/question/6763771
brainly.com/question/6443626
#LearnwithBrainly
