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Q: A worker takes 15kg object and put the object 1 meter above on his head from the surface of earth. Then work done by the worker is – (g = 10 ms–² ).
  • A. 155J
  • B. 150J
  • C. 140J
  • D. 100J
Correct Answer: Option B - Given, m = 15kg g = 10m/s² h = 1.0m As work done by an object is equal to the potential energy stored in an object. Therefore, W = mgh = 15×10×1 = 150J.
B. Given, m = 15kg g = 10m/s² h = 1.0m As work done by an object is equal to the potential energy stored in an object. Therefore, W = mgh = 15×10×1 = 150J.

Explanations:

Given, m = 15kg g = 10m/s² h = 1.0m As work done by an object is equal to the potential energy stored in an object. Therefore, W = mgh = 15×10×1 = 150J.