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Q: A person picks up 25 kg of weight from the ground and puts it 2.5 meters above from the ground on his head if g = 10 m/s² then work done by the person is-
  • A. 225 Joule
  • B. 22.5 Joule
  • C. 625 Joule
  • D. 220 Joule
Correct Answer: Option C - Work done is given by the equation, W = mgh where m = mass = 25 kg g = acceleration due to gravity = 10 m/sec² h = height = 2.5 m Hence, work done = 25 x 10 x 2.5= 625 Joule
C. Work done is given by the equation, W = mgh where m = mass = 25 kg g = acceleration due to gravity = 10 m/sec² h = height = 2.5 m Hence, work done = 25 x 10 x 2.5= 625 Joule

Explanations:

Work done is given by the equation, W = mgh where m = mass = 25 kg g = acceleration due to gravity = 10 m/sec² h = height = 2.5 m Hence, work done = 25 x 10 x 2.5= 625 Joule