A boy carrying a bag on his shoulders walking at angle of 90 degrees does any work or not

Given that

A boy carrying a bag on his shoulders walking at an angle of 90 degrees.

We need to check if the work id done.

We know that the work done is calculated by

W=Fx S x Cosx,

The displacement here is zero hence no work is done. And also according to work-energy theorem work done is equal to change in kinetic energy. No change in kinetic energy is observed. So work done is zero. We know that,

Work Done = F×s×cosx

= F×s×cos90

= F×s×0

= 0

Hence A boy carrying a bag on his shoulders walking at an angle of 90 degrees we can tell that no work is done.

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