karlrey2763 karlrey2763
  • 04-05-2021
  • Physics
contestada

Calculate the work done if a boy lifts a bag of cement 500N to the floor of a lorry 2.5m above the ground

Respuesta :

hamzaahmeds
hamzaahmeds hamzaahmeds
  • 05-05-2021

Answer:

W = 1250 J = 1.25 KJ

Explanation:

The work done by the boy is due to the change in the position of the cement vertically. Hence, the work done in this case will be equal to the potential energy of the cement:

[tex]W = P.E\\W = mgh[/tex]

where,

W = Work done = ?

mg = W = weight of cement = 500 N

h = height covered = 2.5 m

Therefore,

[tex]W = (500\ N)(2.5\ m)[/tex]

W = 1250 J = 1.25 KJ

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