After 30 minutes of holding a 3 kg hay bundle over his head, Rajesh becomes exhausted. The work done by Rajesh is_________.

Choose the correct answer.

• Work is done whenever the given two conditions are satisfied: (i) A force acts on the body. 
  (ii) There is a displacement of the body due to the applied force.
• When the person holds the bundle over his head, the displacement of the body is zero. The force applied by the person on the bundle is also zero, although the weight of the bundle is acting on the bundle.
• Here the person gets tired because of muscular fatigue. Due to muscular effort, the muscles get strained, and this causes muscular fatigue.

Therefore, the work done is zero.