NCERT Question 13 - Chapter 11 Class 9 - Work and Energy

Last updated at July 25, 2026 by

A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer

Answer

Person holds a bundle of hay over his head.jpg

 

Work is done when

  1. Force is applied
  2. Displacement takes place
  3. The angle between the force and displacement is not 90 ° .

 

When a person holds a bundle of hay over his head,

he applies force to hold it

but there is no displacement.

 

Since the displacement is zero, no work is done.

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