A 1.60-m tall person lifts a 2.60-kg book from the ground so it is 2.30 m above

Question

A 1.60-m tall person lifts a 2.60-kg book from the ground so it is 2.30 m above the ground.

A. What is the potential energy of the book relative to the ground? Express your answer to three significant figures and include the appropriate units.

B. What is the potential energy of the book relative to the top of the person's head? Express your answer to three significant figures and include the appropriate units.

C. How is the work done by the person related to the answers in parts A and B? Select one option below

A. The work done by the person in lifting the book from the ground to the final height is the same as the answer to part A B. The work done by the person in lifting the book from the ground to the final height is the same as the answer to part B

Explanation / Answer

a) U = mgh = 2.6*9.8*2.3 = 58.6 J

b) Uh = 2.6*9.8*(2.3-1.6) = 17.84 J

c) The work done by the person in lifting the book from the ground to the final height is the same as the answer to part (a),58.6 J

the workdone by the person is not related to the answer to part (b)

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