CBSE-IX-Science
15: 2-Work and Energy
- #13A 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.Ans : When a person holds a bundle of hay over his head for 30 minutes and gets tired he applies force in upward direction and displacement of bundle of hay is in forward direction which is perpendicular to the direction of force applied therefore displacement is zero
No work done.