SAFIUL303
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A girl picks a 0.57 kg book up off the floor and places it on a bookshelf 1 meter above the floor. The book now has 5.6 J of potential energy, how much work did the girl do?

Respuesta :

Answer:

Work done to pull the book upwards is 5.6 J

Explanation:

As we know be the relation of work and potential energy that change in gravitational potential energy of the system is equal to the work done on it

so we will have

[tex]W = U_f - U_i[/tex]

when book is placed on the ground then its initial potential energy is given as

[tex]U_i = 0[/tex]

final position potential energy is given as

[tex]U_f = 5.6 J[/tex]

now we have

[tex]W = 5.6 - 0[/tex]

[tex]W = 5.6 J[/tex]

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