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Q: A worker raise 10kg object from the ground and put 1.2m above on his head then work done is- (g = 10 ms–2)
  • A. 120J
  • B. 155J
  • C. 150J
  • D. 140J
Correct Answer: Option A - Given, m= 10kg h = 1.2m acceleration due to gravity (g) = 10 ms⁻² As work done by an object is equal to the potential energy stored in an object. Therefore, Work done = m gx h =10x1.2x 10= 120J
A. Given, m= 10kg h = 1.2m acceleration due to gravity (g) = 10 ms⁻² As work done by an object is equal to the potential energy stored in an object. Therefore, Work done = m gx h =10x1.2x 10= 120J

Explanations:

Given, m= 10kg h = 1.2m acceleration due to gravity (g) = 10 ms⁻² As work done by an object is equal to the potential energy stored in an object. Therefore, Work done = m gx h =10x1.2x 10= 120J