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Q: A man puts 20kg object on his head by raising the object 2m above from the surface of earth. Then work done will be –
  • A. 400W
  • B. 400J
  • C. 200W
  • D. 200J
Correct Answer: Option B - Given, m = 20 kg, g = 10 m/s², h = 2 m Work done = Potential energy of object W = mgh = 20x 10x 2 = 400J
B. Given, m = 20 kg, g = 10 m/s², h = 2 m Work done = Potential energy of object W = mgh = 20x 10x 2 = 400J

Explanations:

Given, m = 20 kg, g = 10 m/s², h = 2 m Work done = Potential energy of object W = mgh = 20x 10x 2 = 400J