A book is falling from the top shelf of a bookcase. Which statement correctly describes the change in the energy of the book? a. The potential energy and kinetic energy remain the same. b. The potential energy decreases as kinetic energy increases. c. The kinetic energy decreases as potential energy increases. d. The kinetic energy remains at zero, but potential energy increases.

Correct answer letter b.

Explanation:

When the book is on the top shelf of the bookcase, it just only gravitational potential energy, due to the gravitational field and the kinetic energy at this point is zero because the book is at rest.

Now, when the book starts falling, all the potential energy will transform into the kinetic energy. It happens, thanks to the conservation of the energy,that says energy can neither be created nor destroyed, energy can only be transferred or changed from one form to another.

Let's recall that the gravitational potential energy depends on the object's position, so when the book falls, the magnitude of the position decreases and the speed of this object increases.

Therefore, the potential energy of the book decreases as kinetic energy increases.

Correct answer letter b.

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B

Explanation:

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