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Q: A porter picks up 12 kg of goods from the ground and places it on his head 1.5 meters above the ground then work on the goods to be done by him is: (g = 10 ms⁻²²)
  • A. 140J
  • B. 150J
  • C. 180J
  • D. 155J
Correct Answer: Option C - Given, m = 12 kg, g = 10 ms⁻², h = 1.5m As work done by the porter is equal to the potential energy stored in an object. Therefore, W = mgh = 12x10x1.5 = 180J
C. Given, m = 12 kg, g = 10 ms⁻², h = 1.5m As work done by the porter is equal to the potential energy stored in an object. Therefore, W = mgh = 12x10x1.5 = 180J

Explanations:

Given, m = 12 kg, g = 10 ms⁻², h = 1.5m As work done by the porter is equal to the potential energy stored in an object. Therefore, W = mgh = 12x10x1.5 = 180J