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Q: In which of the following work is not done –
  • A. A wind mill raising the water from well
  • B. A donkey put a weight on his back
  • C. Suman is swimming in a pool
  • D. A engine is pulling a train
Correct Answer: Option B - A donkey is carrying weight on its back, in this case no work is being done because the displacement of the object is perpendicular to the direction of the force applied. W = f. d cosθ = f. d cos90⁰ =0 W = 0
B. A donkey is carrying weight on its back, in this case no work is being done because the displacement of the object is perpendicular to the direction of the force applied. W = f. d cosθ = f. d cos90⁰ =0 W = 0

Explanations:

A donkey is carrying weight on its back, in this case no work is being done because the displacement of the object is perpendicular to the direction of the force applied. W = f. d cosθ = f. d cos90⁰ =0 W = 0