Question

An object of mass 2 kg is raised to a height of 1.5 m above the earth by Amit and Rakesh as shown in the diagram. (given g = 9.8m/s2)
(i) Who does more work? Justify your answer.
(ii) Calculate the work done in both the situations.

Answer 1

Answer:

(i) both does the same work because potential energy is equal to mgh and height of the both are same

(ii) work done in both the cases will be 29.4 joules since work done will be same in both the cases

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Answer 2

Answer:

(i) both does the same work because potential energy is equal to mgh and height of the both are same

(ii) work done in both the cases will be 29.4 joules since work done will be same in both the cases

Explanation:

(i) The mass of the body and the height of the both are the same so the potential energy is the same

(ii)In the first case

          the mass of the body is:-2 kg

           the height of the body is :-1.5 m

           g=9.8m\s²

potential energy=mgh

                           =2*1.5*9.8

                           =3*9.8

                           =29.4 joules

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