Chapter 10, Problem 80A

To determine

Whether the student do any work or not.

Explanation of Solution

Introduction:

Physics teacher is correct

Because from the definition of work in physics is force ( F ) times displacement ( x )

That is work,

  $W=Fx$

Here, x is displacement and F denotes force.

In the given case, displacement is 0

Because the student came back to the same point where he had started

So,

  $W=0$

And here the agreement should be on carrying cost, not on the work done as per physics. There should be a suitable payment for going up and coming down.

Conclusion:

Physics teacher is correct in the sense of the definition of work in physics and to get paid properly, student should make an agreement for payment on carrying cost.