Question

A person holds a bundle of hay over his head fir 30 minutes.What will be the work done?

Answer 1

Answer:

zero as the displacement is zero

Answer 2

When the person holds a hay over his head for 30 mins, even if he gets tired,  but according to physics, there is no work done as in this case, the person doesn't displace from one point to other. The mathematical explanation is as follows :-

                                               Work done = Force x Displacement

Here, displacement is zero, so -

                                               Work done = Force x 0

                                            ∴ Work done = 0 Joule